Here is how it usually works: buyer makes an offer, seller accepts or refuses, if seller accepts you move to the next step. This is where you simply print off a bill of sale from the local DMV website, when buyer arrives you head to your bank to deposit funds or have buyer transfer funds from his bank(this is very easy if you both use a credit union as they can verify much quicker), then fill out the bill of sale and sign the title over. Make sure you remove your plates and clean out the glove box. I have bought several cars across state lines without issue, nothing complicated about it.