LOL I've never had that problem!
I'm quite uncoordinated and clumsy if I can't get the right angle at something. I've never been successful in trimming nails while the dog is upright. So I would likely start working on having the dog accept being turned on its side or back. When she is laying down and resting, quietly sit beside her and rub her belly. If you get the really good spot (kinda just below their ribs where the hair meets the pink belly on her flank) and scratch it just right, they will often roll over on their back in pure bliss! Just do short sessions, don't force her to go farther than she wants to at the time. Next time, if she is laying on her side, gently roll her over onto her back and then immediately back to her side. Don't hold her on her back for any length of time, just go smoothly and calmly from side to back to side and leave it at that.
If she is reasonably comfortable with handling, then just start picking her up and holding her in your arms in different angles and positions. The trick there is to move confidently. If you move in a jerky fashion or seem unsure of yourself, the dog will sense that and not feel comfortable or safe in your arms.
I start from a very young age with this sort of exercise so it never has reached a point where I couldn't manipulate my dogs' position. Picking the dog up, turning it on its back, flipping it on its side, etc. The more you do it, the more comfortable and accepting they will become of the process.
It's now routine that when it is time to do their nails, I will sit on the floor in the living room, and call one of the dogs over to me. They will walk over and stand perpendicular to how I am sitting. I then pick them up, say "flip" and flip them over on their back. Swivel them around so I can hold them steady between my legs, bum closest to me and head by my feet. Clip clip clip, all done!
