How much is that 'relax & wax no-scream cream' & where can you get it from?

Basically i'm getting the brazillan wax on friday, i'm dreding it, i'm so so scared about how painful it will be because i can't cope with pain! i saw on youtube that one of the girls who had it done said it was the worst pain she ever been through, she said it hurt more then her getting her tattoos and now i'm really freaked out about it :/ i'm only 17 years old and i just want to know what the pain would really feel like for me but i have no idea untill i go through it, but i don't be crying! i really want to numb the area down there so i can hardley feel the pain and this is why this cream has catched my eye! is it worth getting?! how much is it ? could i get it from boots, superdrug or something? does a paracetamol help aswell if you take about 2 of them bout half an hour before the appointment?! i need the BEST advice you can for me to survive this painful moment i'm going to have to go through, i want it to be pain free, so give me tips , first of all about this cream! thankyou so so much anyone who comments it will be must appreciated ! <3