I'm currently playing with stupid ETC rules,
Running a solo BSB slan on light.
Plaque of Tepok
Obsidian Amulet
Focused Rumination
Belcalming Congitation
Soul stone
Higher state of consciousness
Crown of command
This way I have only spent 530 point's on general, BSB, 4 lev, mage, and tarpit character, like the DE lord. Even brake lone monsters like hydra, flank charge the thing, and smile, you just won combat by 3) Leaving the rest for unit's.
but back to the topic, If you want to be great you need to follow
KillerK's guide to greatness

.
1. KNOW THY RULES, you need to have the BRB + all erratas, to all army's + army books memorized, and potential strong army list's, as well as any surprised a list/items each can muster. This way you wont be surprised by any thing, and the chances that something unexpected may happen that will cost you the game will be minimal. Know all the loop holes in the rules, so you can watch out for them (having knowledge of loop holes, doesn't mean you should always use them), but sometimes it comes in handy.
2. KNOW THY TACTICS, use the rules with full understanding, to isolate weak point's of enemy list's, and hit them where it hurts. Thing's like baiting, speed bumping, tar pitting, delaying are not tactics they are tool's to achieve a tactic. Not to mistake for tactic on it's own, many players don't see the difference. Have to have prepared different scenarios of how to defeat a certain army/build.
3. BE A GOOD SPORT, AND HAVE FUN, a great attitude will get you further then the above, people will want to play you, even if you massacre them, because your a fun opponent. And the game will be much more enjoyable. If you enjoy the game you will have greater motivation to play. (a good trick is change an army or gaming system once in a while, so you don't get bored)
4. LEARN FORM YOUR MISTAKES, I have never seen a player, that doesen't make a mistake, during a battle, analyze each battle, talk with your opponent. Ask him why did he did, this and not that, what would he do if you did something different, if your a good sport your opponent will be a fountain of tactical knowledge, remember as much as you can, for analysis later on.
5. TRY TO LOSE FROM TIME TO TIME, If an opponent is struggling to beat you, and failed horribly game after game, take a weaker list and let him gain a minor win, or at least get a draw, (with out him knowing about his), he will have more motivation to play the game, the more motivated players the higher gaming standard's in your club/area, which in the long run will increase your skill, as you will have more demanding opponent's.
6. PLAY MORE, get in more games, tournament's, play with different opponent's, this will make the first two point's fun

, play over the Internet, you can get great opponent's from all over the world, new ideas new possibilities.
7. PAINT YOUR ARMY, player's tend to fear opponent's with a beautiful army, this makes them play more cautiously/defensibly usually they are uncertain, increasing their chances of mistakes, you can exploit.
8. HAVE A GOOD ARMY BUILD, never enter a tournament with an army you have not played a few game with. Most of the time you army will be getting tweaked form game to game, before an event play it, with out changes with 3-4 with different opponent's, so you know what you can expect.
9. Play to the last round or lizard, never give up. I had many game in which I lost my slan in turn 2/3 and still managed to come out with a win. (only time I would consider giving up

, is if time is an issue

)
10. THE MOST IMPORTANT RULE, before deployment you must have a battle plan ready.
THE BATTLE PLAN what to include.
1. Never! ever! expect that something will happen. like a spell will get cast, or that my oldblood should kill those goblin riders and overrun into. This type of thinking will loose you in the long run. Always think what will haven if not. You can always roll bad on power dice, or you can flunk a attack, or the opponent can roll double one's on a break test. Cast a spell earlier that can change the outcome. Always think what if?, many of the times you will go ahead and hope for the best, but be prepared for the worst.
2. if you have a good army list, take a few moment's to deploy your troops in such a fashion, that you will be able to, deal with opponent's nastiness, either by stalling it with skink's teradons and any thing else, blocking with slan work's too. until you take his army apart, or hit them in such a manner that they will not lift from the attack, and use skink's and such to keep his supporting unit's from doing any supporting.
3. If you don't have to risk it then don't. if your winning don't cast any big spell's with the slan, a bad miscast can ruin you win.
4.if you have determination, self esteem, and you can organize your self you will achieve greatness on virtually any thing. Most people don't.
In general that's all

.