Amaral is totally right about getting the instruments, setting the scene and learning the basic techniques. As with your concern about not knowing if your girlfriend will like it or not, I suggest you start it slow. I mean, it's nice that you got the stuff and know what to do with them to be ready but a big part of it is gauging what her reaction will be.
If it's her first time and you totally dont know how she'll respond, take it slow. Like start with vitals. I mean for me, I started out with bdsm and just recently discovered medfet play. I mean, for years Ive been dropping in EC to check out the library, I knew I'm turned on by seeing and reading gyno stuff but I've never really played yet and never imagined I actually will.
Until I met my beau, yes, on the site. And well, he started it slow with me. It started with a rectal temperature taking. At first I was uneasy with it but it turns out I liked it. Then from there, we moved to injections, then enemas, then a whole lot more, I wont bore you with the details.
As with my stuff, I already had the basic stuff as it comes with my job as a nurse, you know, the basic BP set, stethoscope, thermometers, the white uniform, the rest of the stuff like syringes I slowly started hoarding bit by bit from work , then got the enema bag, slowly I realized I already had my own medfet space in my closet. And the progression of me acquiring my stuff depended on how intense our play got.
So it's up to you, atbj. You can get all the supplies at once or you can do it bit by bit depending on your girlfriend's response. What's important is you slowly introduce her to it and not startle her to death by having an entire clinic laid out for her when she gets home, lol. good luck with your play! and do tell us what happens. I for one would want details. 😃