To answer your questions:
?:/ How long would it take to get actually good with insertions?
About a month with daily practice in an optimal visibility areas with straight hairs (ie the forearm) with good magnification. Then it's a long, experience based improvement learning curve that gets better as you tackle curled hairs, and not so optimal areas.
?:Doing my left forearm doesn't seem too bad but I'm guessing doing the right one would be a huge pain?
Probably not, you'll get better using your other hand.
?:I couldn't imagine doing it with the one touch since it's too finicky but with a good machine with foot pedal and what not would it be easier?
Yes, it would. For one thing, the hand-piece is lighter and can be handled with more finesse. With a pro machine, you can change out bent needles as well, and use more appropriate diameters.
?:/ I've only done electrolysis once professionally and it was on my chest using galvanic I believe and I found it painful. Doing the one touch on pubic area is really painful, are professional machines going to be similar?
It's going to vary on different bodyparts. Make sure you go to a few more treatments from a pro before you buy a pro machine. Pain levels might be a factor with you continuing on your own.
?:Really just wondering if professional machines are better and if they even exist in that range. Would love to do blend or whatever the fast method is, as the one touch is way too slow, I have no patience for that.
Spend more money on a good machine. If you go "pro" go all the way. You won't regret it. Better machines pay for themselves over time. Doing what I did, it would have been not so wise to save a couple hundred and do large scale work with a not so great machine.