2. 3 step aider is fine! Use what you have!
3. I guess make some tether tenders of some kind.
1. There are several ways to get around limbs. The way I do it is by attaching my Garda footloop to the top tether below the hitch I’m hanging from and standing. I then put what was my bottom foot tether on top of the limb I want to pass and connect my bridge to it. I weight my new top tether and then detach my bottom and move it above the limb. Proceed as normal or switch back to your standard top and bottom tether.
The easiest methods consist of switching tethers temporarily or at least adding or moving your footloop so you can switch as between the tether you stand and hang from as you go around the limb.
I think
@phatkaw keeps a prussic not being used on his bottom tether which he uses as a grab handle to progress the tether as well as a point to clip into going around limbs. For this method you would first clip your bridge to the bottom tether prusik not in us (This prusik is above your footloop). Then you would stand, unclip your top tether and put it on the top side of the limb. Clip into the top tether, unclip from the bottom tether, move bottom tether above limb. Finish.