Dividing portfolios of multiple SFH's when financed?

[James R. Copeland]

Considering buying portfolios of a few single family rentals on loopnet. The scenario I'm ping ponging in my head at the moment is "What if I take out a loan for this portfolio and decided down the road that I want to sell one of the properties, but not all of them?"

Anyone know how that would work? Would I need to get appraisals and renegotiate the entire loan I assume to pull out the one I want to sell before I'd be able to do so? In layman's terms, is it more difficult than it's worth?