I would suggest getting DH/P to do it for you I did it myself during my pregnancy (only once or twice I think), but it is tricky to get around the bulge ikywim As the massage is done mostly internally I would recommend using a water based lube rather than a massage oil. If you do want to use an oil though a vegetable based oil should be fine. I remember something about being told to stay away from nut oils during pregnancy.

It does take a while so make sure you set aside 30 mins or so. And as for whether or not it helps I can say as I ended up having a c/s with paris LOL!

Goodluck! And they say the Perineal massage can be used as another form of foreplay during your pregnancy

*hugs*
Cailin