While I do agree they should have been explained better to me, I didn't exactly ask either. Originally I was just going to do the heart worm blood test, but he does have a history of hookworms and allergies and I want to be 100% sure he's gonna be ok. Also, the clinic I got the estimate from isn't our regular vet. Their price is a bit more manageable for my budget atm.
Before I go ahead with the appointments, I want to meet the vet that will be doing the procedure and have Loki meet him, as he does have issues with most men. But there's another clinic a good friend of mine recommended to me due to price, and the staff overall, so I'll be checking them out Monday too.
At any rate, thank you both for your replies. =)