I do some freelance from home and have tried using a mother's helper in the past, but a con is that I have had some trouble with them showing-up!
: The older kids who babysit in my neighborhood tend to have lots of afterschool stuff so I tried to use two different mother's helpers to play with my ds1 while my ds2 was napping --- both of them totally flaked out on me a couple of times.
DS1 is in kindergarten so I am back to just doing it during naptime (or at night --- just wrapped up for the evening
) but finding a fun social mom's day out or something might be your best bet (unless you can find a more reliable sitter than I have!!!
Barney & Ben