My MIL came the day after I came home from the hospital and stayed for 2 weeks. I didn`t really want her too but I could not refuse, and was just hoping it would go well. It actually didn`t and has probably ruined our future relations.
I so much wanted to have a little nesting period with just my husband and my new son. However, one good thing was that I ended up having a c-section and my husband had to go back to work asap, and all that with trying to breastfeed (which also wasn`t so smooth), did make someone being there preparing meals and such a good help. It was just hard for other reasons.
Learning how to take care of your newborn is not such a big deal - there isn`t so much to do, really, and you will learn all about it in the hospital anyway. But if you plan on breastfeeding and also trying to get some rest, having someone around to prepare NUTRICIOUS meals and keep the house in order is nice. Especially if it`s your own mother, who depending on your relationship, I guess, won`t take it too personally if you are out of sorts or emotional or whatever(but MILs do

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It also depends on what kind of person your mom is - like how much she will interfere if at all, what she plans to do to help, that kind of thing.
I would just take into consideration the breastfeeding thing and getting good and regular food into you, as well as being able to take rests when the baby is sleeping. But go with your gut. This is your baby and your family.