If Bradley and Thomas have great games in a Game 7 we could win it at home. LBJ has demons at the Fleet Center and that could hellp.
I agree that we can play with the cavs they can't defend anyone and being at home would be huge help some of the bench guys play with confidence. I don't know that lebron has demons playing at the garden though, last playoff series against us he swept us, and the last big home playoff game we had against lebron he had an all time performance (game 6, 2012).
Lebron has had a couple bad showings in his career but he usually rises to the occasion and I expect him to do it this playoffs as well no matter where the game is played. I do however think that the Celtics are good enough to overcome Lebron playing well as long as the cavs defense doesn't pick up.