Ok, so I've been going to my local FNM since the beginning of September (of 2011) and I know how to play well enough and I played at the prerelease for dark ascension and won 2 out of the 4 rounds and stuff but I've never played at a big event like this before.
The main reason I'm posting this is 'cuz I still make stupid/embarassing little play mistakes and when things get too complicated, I usually have to think for a long time/ask rules questions
How can I avoid making little mistakes and play better for the tournement? And what are some more strict rules 'n stuff that I should know?
(also, I don't stick to one deck usually--I borrow a lot of my friends' decks while I'm in the process of constructing one)