I have never had to trim my torts nails, they wear naturally, if they didnt I would be concerned that he isnt walking around enough.
Build up to doing the beak yourself. Get used to handling the tort like you will need to, start feeling around his neck gently, they have muscular little necks so you can give them a bit of a massage, get a feel for the anatomy. There is a point behind their ear scales where you can pinch firmly to stop them retracting into their shell. Like I said they are strong, and they will bloody resist you so you have to be very firm with them, but it doesnt hurt them. All I am suggesting right now is familiarise yourself with the torts anatomy, and get it used to you touching it there, and try to stop it retracting until you are comfortable doing it, take your time but it should be a goal down the line for you to do yourself, the clipping is the easiest part, if you can clip your finger nails you can clip a beak.
Build up to doing the beak yourself. Get used to handling the tort like you will need to, start feeling around his neck gently, they have muscular little necks so you can give them a bit of a massage, get a feel for the anatomy. There is a point behind their ear scales where you can pinch firmly to stop them retracting into their shell. Like I said they are strong, and they will bloody resist you so you have to be very firm with them, but it doesnt hurt them. All I am suggesting right now is familiarise yourself with the torts anatomy, and get it used to you touching it there, and try to stop it retracting until you are comfortable doing it, take your time but it should be a goal down the line for you to do yourself, the clipping is the easiest part, if you can clip your finger nails you can clip a beak.