Simple answer - yes you can alter your funding source after putting it under agreement if you chose to use a hard money lender instead - i would just communicate with seller that hey I was going to use cash (assuming you have it from your heloc) and instead will finance some of it but let them know its not contingent on financing.

I has two GREAT property managers that immediately come to mind, one handling 5 high end high rise condos I owned in Phoenix and the other one handling a 12 unit very lower end apartment building I owned in Arlington, Texas.  

Many have never even stepped foot in the US.

Get a big downpayment so that the buyer doesn't end up in the same situation 5 years from now.

The deal did not go through and they never returned my money.

We have never focused on one area huge mistake.

Never leave tools on a job.

out west here we do our own deeds we never use an agent or title or an attorney..

@Lew PayneLew, never met nor heard of James Piccolo or Five Star.......  

All too often, at the end of 5 years -- that's not what happened.