you wont notice any REAL gains until around the 4-5th week, then you will definitely notice that something is different !! make sure you eat alot, and sleep alot, get at least 8 hours a night to grow bro, and hit the weights hard. yeah my first test cycle upped my appetite big time.
as far as the needle man, do it after the shower, wipe the area with an alcohol swab and when you're getting the airbubbles out the syringe, let a couple drops of oil come out and run down the shaft of the needle, this will lubricate the injection site and the needle will slide in easier.
always use a new needle/syringe for every injection.