Its easiest to move drums using a goods trolley (with a strap to hold on the drum). That way you get a tilt on the drum as well as keeping it vertical.
If you can't access a goods trolley, forget the idea of rolling a full drum (180Kg) it on its edge.
Kick it over onto the ground and roll it along, accepting the fact that you will mix up any water/mud/rust etc inside, so do this as soon as you shut down to give it max settling time.
To pick it up, don't pull it up with your arms, you'll blow your back. Instead, kneel in front of the top with your knees on the ground, push your chest (or your tits) into the top and lock it there with your arms, then push foward with your legs - this rotates the drum upright using leg power only. You'll need to trap the bottom lower lip of the drum so it doesn't slide. You're wearing cargo pants and brown shirt ?
Unless you know for a fact that the pump is in good condition and for aviation use only, bring your own. You'll find Farmer Fred's pump is full of diesal oil, sand, and sheep drench. A rag stuffed into the hose and the spear will keep most dirt out, but Rarely Dble Amber's advice is spot on.
Wipe dust off the spear before inserting.
Pump the first couple of liters into a clean container (usually your own that you have brought along) to check for any junk.
Practise all the drum stuff before you go out and do it for real on a charter the first time, because then you'll be pushed for time and fumbling with the pax watching. This includes getting tools to open the bungs and rope to tie open the nozzle in the fuel cap.
Regardless of whats on the drum, test the fuel with dunny paper. Yep. Get some fuel out of the pump onto the dunny paper. If it dries clear and dry as before, it AVGAS. If it has a greasy translucent appearence, you've got some/all JET, diesal, etc.