I’m in the last year of my DPT.
Most PTAs do not do a lot of manual therapies. If you are in an outpatient setting its more likely. In an acute, rehab, home health, or SNF it’s not as likely you’ll be doing a lot of manual techniques. I myself will be using more manipulations, graston, and dry needling instead of long and tedious forms of manual therapies in part to save my hands. Most therapist who have been through manual therapy fellowships or residencies that I know are the same.
There are definitely ways to be a good PTA without taxing your hands too much. You could also consider occupational therapy asiastant if you are worried about aspects of manual techniques. If you have any more questions feel free to ask me!