It’s hard, because as others have mentioned above, you have to figure out how best to drive your chair *and* hold that door open at the same time.
For me, because I am right handed, and my joystick is on the right, I find it easiest if the door opens to the left (either in or out - towards or away from me) because that lets me use my right hand for the joystick, which is more capable of the accuracy of movement I desire. I can then roll up fairly close to the door, reach out with my left hand, which holds and controls the door while I drive through. I allow enough space to be able to back up a bit while opening the door wide, and then I push the door back as far as possible to give me time to drive forward and clear the doorway. Not gonna lie… I have gotten bumped by doors that have the self-close on them, but I’m averaging a success rate of about 65% these days with no bumps! Yay!
If the door opens to the right, then I will try to pull up to the door slightly off center, towards the left side of the opening. Pull the door open with my right hand, and push it as far back as possible. Once the door is back as far as I can get it, I will use my right hand to work the joystick while my left hand holds the door as far away as possible. I have to make sure I have enough room in front of me to drive over to the right and then forward through the doorway. I usually let go of the door around when I get halfway through. This will almost always result in a “bump” from the self-close on the right rear corner of the chair, but generally speaking, I do OK. This has taken me the longest to master.
There are a lot of things like this that just take time and practice to master. Sue and the others here who said “it takes a lot of time to get used to a power chair” were talking about these exact kinds of things. Most folks can drive a power chair straight in a line, they can even rather quickly learn how to turn in tight spaces, how to back up safely, etc. It’s the “everyday” things - like bathroom doors - that are tough to learn and even harder to master. I may never be perfect at it, but I will keep trying to improve my strategy!