Make a plan around the time frame you have

You have two full days of being a girl so you have to plot out your time carefully. You decide to time it so you end at 6 a.m. the day after the party meaning you will take the pills at 6 a.m. the day before the party. That way there is no chance that you will change back during the party even if you decide to stay late and no one will see you as a guy beforehand.

Next you plan out getting clothes, it would be risky to go somewhere then try to change and get clothes particularly with how early it would be. No better to fish out some of your mom's old stuff from the basement and use that if you can but if not you could at least use the maternity clothes while you shop.

Lastly come the makeup. On your recon of the basement in addition to some SUPER sexy outfits that you are just sure you will never make look as good as she probably could before you were born you find several bottles of the same perfume, some makeup that as far as your tests on your male face go work fine, and some... personal effects of her's including some dangerous looking dildos that look like they are from some kind of hell beast, garters which you take the time to figure out now before you need to, one pair of high heels in your size, and a flat of condoms. You spend a few hours practicing with the heels and watching youtube "how to put on makeup" videos specifically for first time X-Change users.

While it has been all in all a well really fucking weird day you actually feel closer to your mom than maybe you ever did.