I have passed all the three stages of stupidity on my way to becoming a solo diver:
1. Over confident with single tank, yoke.
2. Single tank with double valve/first regs, yoke.
3. Confident with single cylinder and pony, both yoke.
4. Dual cylinder, sidemuounted, DIN.
Now, I'm not going to preach you whether this is the only way to go, or this or that is stupidity.
But- beware of over confidence- there are many things we don't know, including you, most likely. So, in my opinion it is not s bad idea pursuing new skills, further training and experience. You'll always benefit from learning something new, that somehow you didn't figure out by yourself. And you get someone with experience to check you out before you plunge deep into solo.
Personally I started sidemounting on DIN regs after fragging oring burst on me when I was in my third stage of stupidity, lost lots of my back air, pony wasn't enough to get me back, and was on boat infested waters. With side mount you have both valves handy and under your eyes, a free flow is super simple to manage in less than five seconds, entanglements just as easy. Experienced both and was grateful to be on SM. Tanks are same capacity, with simple gas management there is also less risk on way back. Some are happy with doubles backmount, but I think for solo one has less control, no visual on first regs and valves, depend on drills that are more complicated and take more time alone, compared with SM.
My two cents.
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