Sounds like you were doing an OW class. In PADI, that is the last and only new skill in Module 5.
Yes, with integrated weights only, that can be a challenge for anyone - and the difficulty escalates for more buoyant divers, or divers wearing more buoyant suits.
So you have to ask "when would I even need to do this" and then think about how you would deal with that in real life.
The example I give is if your 1st stage is tangled in some fishing line or kelp, and you need to cut/untangle it yourself because your buddy is off in a world of his own. As long as you are able to stay connected to your BCD while you do what you need to do on your 1st stage, you will be okay. Far easier said than done, and since it would be best to practice mid water with some room above and below, it is very difficult to practice in a pool with a limited water column. I suppose another scenario is if your cylinder isn't turned on all the way and you need to finish opening the valve.
So, I can't provide a definitive answer for you, but I agree with
@g1138 that it depends on how much risk you will accept, perhaps joined to what kind of diving you do, and where you do it, with what kind of gear. At the very least, do some visualization of just how you are going to hold on to that BCD for dear life while messing with a tangle, and how you are going to best avoid going feet up while doing so. I will suggest that gripping it between your knees while troubleshooting might be the best way if you are that buoyant.