In reply to AndyE9:
as far as harness goes you'll be just fine with your normal one if it fits well over your clothes. I recently bought a new harness and went for one with self locking buckles on which is nice but not essential. just means i can now completely gear up without taking gloves off at all which is a big pro for me. as has already been said, just put your harness on before your crampons and you'll avoid all that dancing around trying to get your crampons through the leg loops.
as for screws i tend to just rack them on their own draws which works well for me. never used them clippers, i know people who swear by them but for me they just seem like an answer to a problem that doesnt exist.
hope this helps
james