Smart move, go for it. I would suggest taking the B1 & E1 then sit for P1 & M1. I don't know your background mine is electrical and I still found the plumbing exam the easiest.

The electrical & mechanical exams are the toughest if you have no background because of the necessity of having to be familiar with the language & nomenclature of those trades. I spent a month studying and passed all four first try. Let me know if I can help.