First you need to post a before and then an after pic!!
I have never used them. Just make sure you tell them ( and they understand) how you want him cut.
I bought clippers at Walmart- they were cheap like 30$. I use them to trim Peanut’s bum and pee area. Since I have a male when his hair grows down under his belly, it starts to smell when pee gets on there. So in between grooms I will clean up his areas!! Just FYI