Danny, it's really easy, especially after you've done it once or twice! I find them easier than certified check, and I haven't gotten myself interested in the intricacies of Paypal.
Go to any post office. Tell them you want a money order for X dollars. They will want X dollars and ninety cents from you, and will then print you out the money order. It will have the amount in words and in numbers. Check this immediately to make sure they understood correctly what amount you wanted.
It comes in two parts. Fill out the top part as a receipt and reminder for yourself, and tear it off carefully on the dotted line. Save this forever, or at least until the merchandise you ordered arrives, and everyone is happy with the deal.
Now fill out the bottom portion. On the left, the name and address of the person to whom you're paying the money, and a box for the purpose (like, the knife you want). On the lower right, your name and address, so they know who it's from.
I generally make out an envelope, stamped and return-addressed, and bring it to the post office with me, so I can put the filled-out money order in it and send it off right away.