if someone puts a wall up above ico do they get sold too first? or does the orderbook just clear before the ico hits?
No. ICOs are made to be sold at a certain price. If you want to buy above ICO price, your order wont get filled.
You need to have your BTC precisely on the 0.003 price. You better be quick, there is only room for 23BTC left.
Citation needed. I hope you are correct, but I am skeptical that you have a good source of knowledge, this being crypto and all.