Here are a few items I thought were worth mentioning about working on puppet sets specifically and film sets in general:
--Stretch. Stretch again. Maybe one more time.
--Try to pre-empt possible disasters. Plan to be prepared for them.
--Your body will be contorted into uncomfortable positions for extended periods of time. It is not glamourous work.
--Bathe and wear deodorant. You never know whose nose will have to be in your armpit to get the required shot.
--Speaking of bathing....a hot shower saved my life when I got home from set. I wasn't even puppeteering very long and my body was exhausted...this brings me to...
--Consider working on building muscle endurance. I am reasonably fit but even so, my muscles were burning by the time we wrapped.
--Drink lots of water. Sure, you may have to get up from the green room couch a bajillion times to pee but at least you will feel refreshed on the day.
Other tactics:
--Bring something to do. Assume you will be spending more time waiting than on set. If that's not the case---bonus!
--If no wrap time is stated, assume you will be there at least 12 hours. If you are sent home earlier---bonus!
--Stay the hell off set if you aren't needed there.
--When you are about to spoon your eyes out from boredom and/or frustration, remember: you're getting paid to do nothing during downtime, so plant some seeds and watch them grow...repeat the mantra: "You're going to reap just what you sow" but but don't say it aloud because....
--You might lean on your walkie button and inform the whole crew and anyone else within ear shot that you have a penchant for proverbs and Lou Reed.
--Bring some extra snacks in case craft services aren't all that.
--Assume everyone in the room knows everyone else in the world and then work backwards. Re: You will look like a complete arse when you are seen jamming your foot into your mouth.