Usually, the only thing that holds a bottom sash in place is the outside stop - the small interior trim piece on each side of the window that fits next to the sash; this will need to be pryed loose enough to remove the sash. If the sash has weights, it's more complicated & you might consider paying extra to have it done; it's not hard, but complicated to explain because of individual variables.

Thank you, antiquesilver. The sash indeed has weights, so think I'll go to pro route, since it's still relatively inexpensive to do so. Thanks again.