Either way i guess i'll see which route i go in the next day or 2 depending on availability of the 2 i'm emailing back and forth.
i'm talking about full on regulator failures and feathering tanks to breathe off of not just swapping regs and closing and opening a valve when i rise ~6" not when i'm hovering and just switching regulators normally. I'm not expecting myself to also go squeeze into the tightest of restrictions ANY time soon and that is something i'll work towards but not with the goal of taking this training immediately squeezing into the smallest of spots no.
First of all, as others mentioned, 6" is not 6' -> if I am not making other conversion mistakes, it is good.
Try to test your skills and ensure that you can hold your position and your trim,
especially when task-loaded (e.g. during a v-drill). If you are stable with a deviation of only 6" at rest, you probably will be able to maintain a good buoyancy even under stress.
The following things to check are trim, propulsion techniques, and core drills (s-drill, v-drill, light deployment). If everything is good, you are probably ready for overhead training.
As already said by others, the easiest way to test it is to schedule an evaluation dive with an instructor. If the instructor is
good, you will receive good feedback to improve your skills, no matter your level (there is always room to improve). In other words, you are not going to waste any money.
Also like others said in the past you either swear by GUE or you hate GUE. I've seen arguments for both I'm leaning towards what i've been recommended by my awesome sidemount teacher who also is a cave/trimix/ccr etc but we both are living in Texas it isn't feasible for him to teach me unless we fly to mexico together or florida then that's just having to also work around his schedule.
I didn't want to suggest you go for the GUE route. True, the GUE route is a very
good one, but it has some pros and some cons like everything. Out there, you will find valid alternatives; it's up to you to find the best suit for you.
But the core skills behind any good overhead course are very similar. Since GUE standards are well defined, I mentioned them, so to give you an idea. Many
good instructors follow something equivalent. In other words, if you do not have those skills, they will ask you to do a core skill course.
I am sorry if I didn't manage to send the right message; I hope it is clearer now