So, I have respect for all welding processes, all the tricky tests, mirrors, the little box and GTAW test. They seem tricky and even the ol' 7018 open root which I have tried several times and it is tricky but I have done it, not a master by no means.
If you want a challenge here's something you can try. Set yourself up a simple T joint in the vertical position. Now, hang yourself from a harness on a simple 12.5mm rope with your feet supporting you on some U-bolts, not the threaded end but the round end, the base of the U. Add in 5 degree temperatures to make it exciting with 20 mph winds. Begin your simple fillet weld, now here's the fun part. Your mount where your T joint is mounted, have somebody start moving it, simulating two guys higher up climbing around on the tower grinding and trying to remove horizontals and diagonals with force. The movement has to be sporadic, little wave motion, then big whipping motions all while under the hood and the movement completely unknown and unseen by you. Welds must pass visual AWS D1.1 standards. A simple T joint becomes a test of tests. I get my CWI and we start hiring welders, boy, do I have the test for them planned out!! Now add in the coax cable in the way, the ropes up the leg to the block, doing the corner joint with the diagonal bracing on your left, still wanting to use your strong arm(my right) because you need it to have that precision to counteract all of the variables being thrown at you. Your winds speed, must be variable. Add gusts, yes a gust that actually blows your body while your simulation man continues to wobble your work piece, then the wind stops momentarily.
Do all of this and be able to bang out almost 40 feet of weld in 7.5 hours. You want a challenge!!! Pushes my ability to not cuss to the limit at times. Running that perfect weld then suddenly the guys start repositioning and the tower begins to move(this tower is horrible, think popsicle stick tower at 190 feet tall). Strong winds and you literally can watch the top section whip in the wind, resonating that motion all the way down to your position.
Next time you do a saddle and branch, hang it from some rope after you get it tacked up and ready to weld, have two other pieces of rope tied to the rope supporting the pipe and let two guys pull on it variably as you weld. Ahhh, what we do for money!