OK, I did four sessions last week (repeating session 1 in a slightly modified format).
The one arm drills are a challenge. I understand the focus is supposed to be on the non-pulling arm. it's hard to focus, though, when struggling to breath (see above). But, persevere I did.
Pull buoys are awesome. My 50y times dropped eight seconds with a buoy. For longer intervals, the drop is more dramatic (e.g. 40+ seconds for 200y). This just tells me something I already now - my legs are sinking.
Snorkels are another challenge. I find I am out of air at the end of each 25y lap. Again, I spend so much time focusing on getting air that the purpose of the drill is lost.
Kicking is an even larger challenge. At 20y (and after a over a minute of intense kicking), my legs are exhausted and hurting from the "muscle burn" and I stall. Two lengths is the limit.
Since you've promised a "new man", I'll continue to put up with the frustration.