I operate like most of the others here.

I mostly e-mail the contract, fax a bunch, and also have them sign it on site. Once in a blue moon I will over night it to someone that doesn't have e-mail or fax.

I take credit cards to keep payment probelem to a minimum.

If someone refuses to sign the contract? Easy....I'm back in my truck heading out. If someone doesn't like a part of the contract? Easy..we can talk about it and if I agree to their changes, we both initial the changes and move on. If I don't agree to their change? Get the truck keys out.

As far as someone not being able to change a PDF? It CAN be done....Easy.

Anytime I have had resistance about a contract, and it's usually from a Realtor trying to set up an inspection, I just tell them that I am required by my insurance company to have one, end of story. If it's the Realtor giving me a bad time, I ask them if they require an contract when they start doing business with their clients?
JF