Having someone show you is a good suggestion.
Also, if you are a regular customer at a groomer's, they might be willing to do it for you. My best suggsetion is if there is any way to get her onto a work bench or table (I know, she's big), but I think that is part of why they behave for us at the grooming salon. UP is simply not normal so they tend to behave a bit better.
I also have found that sometimes less restraint is better than brute force. Does she like something (like an ear rub or a belly rub) so much that when you do it she seemd to "melt" and say AAHHH? If so, do that while the other person sneaks some drops in the ear. Do the worst of the 2 ears first in case you need to wait to trick her into the 2nd ear.
Best of luck