I can see this being a serious post. First, the above is correct, you don't want to send this request to anyone.
First, you don't actually know what parts need cleaning, which need what oil, and which need replacing. Or how long it takes. If you did, you could do it yourself.
I do a lot of my own work on cars, and I run into similar things. I will run into an issue, be fairly sure I know what it is, but not enough experience to really know. If I were to go to a mechanic and tell him exactly what to do, how much time it should take, which tools to use, he would laugh at me, and tell me to do it myself. Truth is, if I don't feel confident doing it, I need to let the mechanic run his own check list, repair what he thinks is the issue, and not get in the way.
So basically, you are telling someone how to do their job, and they are going to think that even if they do a perfect job, it might not have been done exactly like you said, and now they have a bad review, and who knows what that costs them. After all, if they do the work, they have agreed to your schedule. You'd have a legal case that they did not provide the service agreed to.
Too much hassle.
TLDR; either do it yourself or let someone else do it their way.
