As long as you don't plan on leaving them in for several months, you should be okay, in terms of the difficulty with which they will come down. But in all honesty, the inability to take down locks is a MYTH. I've had my sisterlocks for 3 years and I'm in the process of taking them down as we speak. Yes, it is taking quite a long time (approximately 30-45 minutes per loc) but I've had them up for three years, so my locs have matured, plus I have the shed hair that's within the lock to contend with.
I would suggest that you, keep the "starter" locs in for a few weeks or a month if you're somewhat skiddish about it, it shouldn't matter all that much. However to avoid too much difficulty, I would keep them in for no longer than a month or so and then I would constantly rinse them (maybe every couple of days or so, using a cup or bowl of water while in the tub not
the shower head...then following up with some sort of leave-in condish and/or oil to keep them moisturized) so that they will stay free of dirt and build-up.
I think the good thing about sisterlocks is that they are latched, so you don't have all that additional build-up that comes with beeswax when you're dealing with traditional locs, but even mature traditional locs CAN be taken down. You just need patience...something I'm trying to maintain while I'm the process of taking mine down.
There's another thread that I just posted on where another poster just completed taking her locs down as well. So it can be done!!!!
Hope this helps!