Decided to give it a shot, and went from completely new in BA to getting my fighter torso in only 2 hours!
Highly recommend trying it yourself if you're thinking of getting boosted or are too nervous to go for it. There are videos on youtube that separate each role in 2-3 minute explanations that make it braindead easy. Went down the list starting as attacker then defender, collector, and healer.
Don't waste 100 mil+ on something that will only be half as fast to get carried in. Learning is fun. This is the most community interaction I've had in years on this game.