Everyone around here gets $100 to body clip and $150 if they need to bathe and dry the horse. Its extra if the mini doesn't stand quiet for clipping or an extra handler is needed. I think they get $40 to trim and I know a lady close to me who charges $2 a minute to do patterns, stencils etc. Whatever you charge, you need to ensure that you cover the cost of blade sharpening, oil and coolant. Also, you should figure out how long it takes you to do a clip, decide what a fair hourly wage is for you and aim to stay in that ballpark, otherwise, you'll be working for free. I have done this for people in the past, and it worked better if I went to their farm, as many people around here do not vaccinate/vet their horses and I will not let un vetted horses into my barn. You may want to draw up a liability waiver to protect yourself in the event of an incident. You cannot always trust people, even if you know them, things happen, and if you accidentally nick a horse while clipping, or it develops a rash or if you accidentally take too much hair off (or something of this nature) you don't want problems.