It is posible to that long awaited power armor training at the start of the game. Requires operation anchorage, after you leave the vault wait for the radio signal. Go to quest location and let outcast fight there way to the base for you. Then do quest when you fnish you can automaticly wear power armor.
P.S this works at any point in the game
P.S.S send spinachhead95 a friend request if you need more fallout 3 help