Yea I trim Reeses myself. I chose to do it myself because if he gets scared or anything I can stop and give him a break and play with him. Makes it not so bad for him. Also if I start trimming, I can see what it looks like as I go along so if I need to do something different to make it look better, I can. If a groomer does it..they do it all at once and when its done its done whatever it looks like is what it looks like. Lol.
As for tips....dont try to do it all at once and fast. Take your time and take play breaks to make it not so stressful to your baby. Also...be sure and get a quiet clipper...I have...Oster Golden A5 single speed clippers...they are very quiet clippers!
If there are any specific questions you want to ask..go for it...I dont mind. I worked at a Vet's office as a kennel attendant but I was also the one to groom the pets either to be groomed or prepped for surgery. Plus I have trimmed my baby's hair his whole life..he's a lil over 1 1/2 yrs old.
Goodluck with everything!