First, this is a fetish of yours and you want to be fulfilled because it will make you happier--like saving money to go to a good restaurant or a vacation. However, your financials should be secure before you can enjoy your fetish. My advice is, if you are living pay-check to pay-check and this adventure will impact your regular life, then you should post-pone your adventure until you are financially settled. Its a fetish you have and you have lived life without it for years now, delaying it a couple of weeks or months shouldn't be a problem to you (I hope). If however, you are willing to ignore my first advice, then make sure your actions does not financially impact your family--sorry for the lecture, I am guessing you are old enough to know about this, but since you stated it, its just my advice.
Now, its just a fetish, and its not an extreme BDSM. So, just go there, relax, and enjoy yourself. You mentioned that the provider is welled reviewed, so you have nothing to worry about--i.e. an LE sting. She's human, and you shouldn't be embarrass about it [are you?] or nervous about the journey to come, otherwise, she she wouldn't offer her services. In my opinion, just go there and pretend you are going to a shoe department, and just see where it leads from there. My advice on how to psych yourself up: well, its really nothing radical, you do not have to psych yourself up. If you are willing to go because this is what you want, then "Just do it". Just don't think too much about it, she's just there for entertainment purposes. Once you've done it, you would've have to psych yourself up the next time. Well, enjoy.
