Honestly it'll be fine - I have 0 pain tolerance and I've got all my tattoos without numbing cream and I don't think it's used all that commonly from speaking to my artists. Eat a lot of things like carbohydrates, my first tatttoo artist told me to eat potatoes before so now that's what I do every time haha, but it'll be fine! You can let your tattoo artist know you're nervous and they will help you feel comfortable but usually they do check in with you regularly. I would mention the numbing cream too. The tattoo artist will put clingfilm on after your tattoo is done with some moisturising cream and you leave it on for about 2ish hours to let everything set in, and then you can wash it with non-hot water. Remember your ID!! And for aftercare the tattoo artist will advise you and different people do it differently but main thing is keep it out the sun (that applies forever, sun cream is important) and don't go to saunas or swimming pools etc, keep it clean. I personally like to use Tattoo Goo products from Superdrug which come with a soap for it and a moisturiser, make sure to moisturise it at least 3 times a day for the first few weeks and be prepared for it to be itchy and scabby while healing but do not pick at it! But some people also just use cocoa butter or something, personally I used it for 1 tattoo but felt it clogged up my pores too much so I rather spend a bit more on Tattoo Goo.