What is the procedure for paying off existing home mortgage

You can call the lender or send them a letter, requesting a payoff statement. Ask for the payoff amount as of the date that you expect them to receive the payment. For example, if you call them today and you plan on sending out the payment next week, you can ask the for a payoff statement as of Friday, November 14th. If you end up overpaying they will return the overpayment to you.

Thanks Lisa... what about receiving the original copy of the bill of sales etc., how soon should I expect that, and do you reccoment having a lawyer getting involved

When you pay off the loan the lender should return the original Note to you and they should have a cancellation of the Mortgage recorded in the county clerk's office and then returned to you. Be aware that this can take weeks and even months to finish, though. :)

You shouldn't need an attorney to handle the payoff of the loan.