As we're right now during a spacewalk, we're just past the 40th anniversary of the first spacewalk and nearing the 15th anniversary of the HST in space, I've just read an interview if ESA astronaut Claude Nicollier (who performed a spacewalk to repair the space telescope). (Plenty of publications coming out for the HST's 15th anniversary, BTW).
Claude says this: there are 4 golden rules in spacewalks:
1) Don't be claustrophobic. (Spacesuit and hatch are 2 obstacles ruling claustrophobia out).
2) You can't work floating, you have to be stable, you have to find a way to anchor your feet somewhere in order to use the hands (no wonder the RMS won against the MMU).
3) Do not let go of anything!!!!!!! (If in a a swimming pool, during training, the astronaut looses someting, there's a real enquiry, later!
4) Wile in the night side, do not fal asleep! Apparently, the Russian Orlan spacesuit now also has lights (not the case before) enabling the astronauts to keep working (too bad, they can't stop and admire the stars as they did before.

Raoul