One thing to consider is how much you will use the rolled hem foot. I say this because I have found such a learning curve to actually making them work that I find it easier to fold by hand. If this is a one shot deal, decide how much effort and money you want to invest in the project. If you are going to be doing a lot of it (by _your_ definition) then it may be worth getting the hang of those beasties. I never found it worth while... nor did my professional seamstress wife. But you may love them after you figure it out.
I may be slow... But I sure am gimpy.
"Bless you child, when you set out to thread a needle don't hold the thread still and fetch the needle up to it; hold the needle still and poke the thread at it; that's the way a woman most always does, but a man always does t'other way."
Mrs. Loftus to Huck Finn
We Don't Sew... We Make Gear! video series
Important thread injector guidelines especially for Newbies
Bobbin Tension - A Personal Viewpoint