Mike,

Love your installments, especially having gone through it myself !!!

If you can't make a standing rest use a car (preferably a 4wd) and lean over the bonnet.

One word of Caution - cover the bonnet with a non flammable blanket or piece of
canvas to protect the paint work.

Or use some Milk Crates or something to build up a ret for your forearm
until it is comfortable. These 2 ways will help.

Then practice without cartridges until you get the thu,b out of the way.

500 Nitro