Arm lift and movement
Were you given various instructions to read over? I'm having these next week and my pre-op info says that after surgery I can't lift my arms above a 45 degree angle for some time (can't remember quite how long). But feeding yourself and holding a book shouldn't be an issue. Mainly you need to make sure you're keeping your arms a bit elevated anyway when you're sitting/laying down so that the blood isn't all running down to your fingertips and causing crazy swelling in your hands.
No idea about the blood pressure part though!
I had a LBL and my arms done at the same time. I had no issue feeding myself or holding a book but had a hard time concentrating on the book due to the pain meds and leftover anesthesia. My mom (who's a nurse) stayed w/ me for the first week so did most of the things around the house. After that time she just made sure everything was basically at waist level or slightly below so I didn't have to reach too far for anything.
As for the blood pressure, I think they used a cuff on my calf. But it's been 6 years so can't recall too much but I think that's what happened as your arms are out of the question.
You will be able to feed yourself. Your bp will be taken on your lower leg, close to your ankle.
Good luck,
Annette