I mainly plan on doing boat dives in warm water. My problem is that once I have my gear on, including the tank, I cannot stand up. I imagine most boats have a little seat and then you need to get up to sit on the edge in order to do the backward entry thing. Not being able to stand up just felt humiliating. I've been told I should not feel that way, but I really want to be independent and not the old lady who needs help.
Congratulations, Tanya! My mom got certified 6 years ago at the age of 62 and she's been a diving maniac since.
As for diving in warm water from a boat: your difficulty with standing in the boat while wearing your gear is far more common than you realize (because you only get to see the people that are on your boat that one day.) Just say something to the crew. The simple solution is that they'll have you get in the water and lower your gear into the water for you. You'll then put your gear on in the water. They do this far more often than you would imagine.
The only requirement is that you have to be comfortable putting your gear on in the water (which is why it's a required skill in the OW course.) If you are... problem solved!
At the end of the dive, you can reverse steps: take your gear off while in the water, and the crew will haul it into the boat for you. Seriously, they love doing this kind of thing... because it usually means a little extra in the tip jar for them.