If you feel like you have a bunch of shit stuck on your ass, probably wipe first and then begin the spray. I wouldn’t want shit-clumps splattering all around the bowl area.
What I do is alternate the water and the TP until the TP shows nothing but water. It may take a couple of sprays and wipes, but the end result is a much cleaner ass than wiping alone could ever accomplish. I might be using about 60% as much TP as without a bidet but I don’t care, because my ass is very clean.
BTW this requires decent TP that will hold up to gentle wiping of wet areas, not the cheapest weakest TP will suffice.
It depends on who you have it with. If your partner is good at it then it’s one of the best experiences that life can offer. If either / both partners are not good at it, it can still be good and satisfying for one or both partners. Overall I would choose sex over any other awesome activity, unless the other awesome activity was something rare that I may not get another chance to experience.