too much?

would it be too difficult for a first time shaper to add concave to a longboard? also, i’m still wondering if i should try to glass the board myself (after only seeing the glassing 101 video) or if i should get it professionally done? the video makes it look relatively possible, but from what i’ve heard, this part is the most prone to screwing up. one more question, having never seen a step deck except in pictures, i was wondering if step decks are used in conjunction with concaves. or would this be too much foam removal? thanks for your time.