I have been solo with
ecv multiple times and at first I did worry about how to open doors, etc. What I have discovered is there are only a few places that do not have automatic doors and when that happens the most likey scenerio is a friendly stranger will rush to help. It must be something about Disney because I seem to encounter more helpful people there than anywhere else.
For counter service restaurants, there is usually a line marked for handicapped that is more accessible. After ordering or when being handed my tray, I am usually asked if I would like some one to take it to a table for me.
At first I would say no because I can manage and am quite independent. Howver, once a nice young man leaned over the counter and whispered to me that it would be a nice break for him to carry the tray. When he brought the tray out to me and we traveled together to find a table, he explained that bringing out of tray gives them a nice change in their routine and from his manager, they get good feedback for being "guest friendly".
Now a word about opening hotel room doors. First, turtle speed is your best friend. Second, get the ECV lined up at the correct angle to the door opening and then, unlock the door (magic band or key card) and push the door open with the scooter. For doors that open out (think exiting room), the advice chirurgeon gave is exactly right.
You can do this and you will meet some very nice people.