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What some people do is sit down in front of the scuba kit, slip into it, then role over onto their hands and knees then stand up.
A lot of places that allow shore diving have no issues with people putting on their gear while in the water so long as the conditions are reasonable.
The challenging part of diving in cool / cold water is all the weight along with thick garments to keep warm. In the tropics where the water is warm you will not have to use so much weight.
Hopefully this helps.
All good stuff above. Just to add, when using a picnic table or bench, make sure you lay out all the "other stuff" (mask, fins, anything else you'll need) next to your rig so you don't have to bend down. At the springs, I'll put my fins and mask on the table, put assembled rig standing up on the table, turn and put the rig on, grab fins and mask and walk to the entry. Keeps you from risking back issues bending down with a tank on.
These two. If nothing else I use the open trunk of my car for donning and doffing. I usually dive a backplate wing where the shoulder straps can't be adjusted even in a drysuit I can get my gear on and off with little or no help by setting the bc/tank on a bench table or my trunk.
I’ve never been to any OH quarries, but that description reminds me of Devil’s Den in Florida. DD is a freshwater spring dive site near FL cave country. The dive site is actually underground, but there is a hole in the ceiling that lets some light in. I’ve gone along on both my daughters’ checkout dives here.
There are tables and benches for gear setup topside. Each diver is supposed to gear up at the tables and walk to the site. Access to the site is a small cave that leads to a stairway. Shorter divers have an advantage here as the opening is significantly less than 6’ high. The next part has been improved in the past several years, but it used to be a small rickety wooden staircase to get to the platform at the center. There are signs stating one diver at a time, and the old staircase would creak and sway under one diver’s weight. Newer staircase is better, but it can still be a bit scary for a new diver.
Get one of these, “keeter (damn spell check) folding work table” best dive table I’ve used. For some reason I can’t post a link, they make a simple one and one with more features, simple one does everything.