First of all, dilation for the first month is 4x a day... and doing it in a bathroom is NOT recommended. I've heard of women flexible enough to pull it off (though personally I can't imagine how, I couldn't do it), but it's not a hygienic or sterile environment at all, and you'd risk an infection in the early post-op period. Brassard even banned pets from the bedroom and having a fan blow on the surgical site for the first couple months, and I cant imagine a public bathroom would be cleaner than that.
With that said, I did go back to work at precisely 4 weeks post-op and was fine, though I wished I'd taken another week. Energy-wise you should be OK, but you may need to see if you can find an unused conference room or something - and bring a clean pad to lie on.
Dena, personally, I need to have my knees up and apart.

That position seems to open up the vaginal canal the most (for cis women as well, or so the sex guides say).