From what we were taught, it’s better for the smallest person to help the bigger person first so the smaller person doesn’t have their gear on while trying to help the bigger person. We didn’t really stick to this. We just went back and forth. It was very difficult for me to hold up my partners tank while they latched their bcd.
For context, I'm "AOW" (Advanced Open Water) certified, not an instructor, with side-mount (another gear configuration) experience. I'm not familiar with the advice the above advice, though I guess it makes some sense.
For the vast majority of my dives, I have always donned my gear with little-to-no assistance. The primary exceptions are (1) During a class. (2) Minor assistance - such as "can you grab my fins?" (3) On a (paid) dive charter/boat. As you become more experienced, you want to be able to complete the donning (and doffing) procedure without assistance. The reason is you want your donning procedure to be consistent and reliable. Regardless whose "fault" it is, if someone makes a mistake, it is your own safety and wellbeing on the line.
On a very subjective (just me) note, I've found that when people assist me, I'm distracted, and make FAR more mistakes, including "newbie mistakes."
The "buddy checks" I consider separate from the above advice. Always go through the self-check first by yourself. 99% of divers should be more than happy doing a buddy-check on your gear (avoid the other 1%). Experienced divers may not ask for a buddy-check (whether they should is another topic), but should still be more than willing to buddy-check your gear.
I was supposed to wear a hood during my ow dives because it was early June and I live in Ohio but the hood was tight in the upper face area and loose in the chin area so I didn’t wear it. The chin piece kept going over my mouth and my upper head just felt constricted. It was what they rented to me. I just chose not to use it.
Your hood may have been one size too small. I can generally get good thermal-protection from a wetsuit hood, without it squeezing my head. Even as someone who is not very big/tall I wear a large hood.
It's entirely possible that for some hood-brands, small is too-small, and medium is too-big, so you might have to try more than one brand. It might be worth asking a shop if they'll let you try on rental hoods of various sizes and brands, until you find one that fits, and buy it. Hoods are usually not that expensive.
I greatly appreciate any tips and suggestions that anyone might have for any piece of gear, especially with putting on the bcd and helping my buddy with theirs. It was such a struggle for me to get my gear on and help my buddy and I don’t want this to discourage me from diving!
The best-case scenario for donning gear, is usually to use a bench (on a dive-boat, picnic table, etc). It can be FAR more challenging to don/doff the BCD from a standing or sitting position without assistance.
You can also don a BCD in the water, but I'd suggest only doing that in standing-height waters. Setup your tank/regs/BCD on shore, air on, BCD inflated.
(Failure to have air on may result in needing to service your regulators) Walk out until the water is a little above your waist, and then slip on and secure your BCD.
I am very small, 5’2, and I weigh 120 lbs.!
If your air-consumption-rate is much lower than average, you may also consider diving with a smaller (lighter) tank, like a 63cu, instead of 80cu (standard size). You may have to call around local shops to see if any in the area rent those.