I have a small level we use when setting up. I use it on the floor and kitchen counter. This works for me:
1. level side to side whilst hooked up to TV. I use the plastic pads / levelers but you can use wood too. I put pads under low side (both wheels) until level.
2. Chock wheels just in case AS decides to move whilst adjusting fore and aft while unhooking from TV
3. Disconnect from TV then raise and lower Jack to get level fore and aft. I usually put blocks under the Jack foot too.
4. After leveling put down 4 feet. I put plastic pads under them when on gravel pads or dirt. It helps them not to sink in as much. I do find that I need to go around once and put them all 4 down then go around again and snug up as some tend to be less snug to the ground as I put down the others. I also often need to check them again after a day or so due to settling when not on concrete.
If you put down all the levelers and then adjust fore and aft you can put significant strain on the arms and possibly bend or damage them imho.
Btw, step 5 is of course enjoy a Tennessee sour mash beverage.