Can a handle returning to work?

Hi all. I have not worked in 4 years due to surgeries (neck fusion and hip labral tear repair) and difficulties with RA (fatigue, etc). I am feeling a little stronger now and have a possibility of returning to work part time (found out today that I made it to the interview round). Thing is, I am an occupational therapist by trade and the job will be working in a hand therapy clinic, which I have done before being diagnosed with RA. My concern is can I really tolerate 30 hrs a week using my hands as a therapist? My thinking lately is that my hands will be hurting at a desk job with answering phones and typing all day. At least with this job I could move around some, which we all know is important with RA, and returning to my chosen field. I am sure I am just having self doubts/questioning due to the unknown and realizing that 30 hrs a week would not qualify for intermittent FMLA (or at least I don't think it will) should it be needed again. Has anyone else felt this way over returning to work and the job worked out well afterall? I'm in new territory with the RA portion and just looking for some advice and support, I guess. Thanks in advance.