I will be taking my cat to be neutered soon and just want to know how it works. Do i need to go in before hand for testings or anything? and do they charge for the testing? how does the neutering process work? also..is it good to give pain medications/antibiotics after ? cuz they said they give a pain injection so it wont be necessary after..is that true? i havent done this before so i don't know anything about it. someone help me out!