By all means try it if you want I just can attest from working in the field that it is a pain to determine what is and what is not a parasite. Thereare many other factors like knowing the life cycle of each parasite and where it lives during that life cycle. Regardless of it you think you can spot one, you still need to take it to a vet so more than not you will misdiagnose parasites so to me, a $60-80 bill annually is worth it for my pets.

Do it if you want but it might not turn out as easy as your think is all I am saying.