I think finishing it yourself sounds great. It's a big quilt, but just worry about the part in front of your needle. You might want to make sure you have something to support the weight of the quilt behind your machine and off to the left side, like a card table or ironing board.
I read a blog by a machine quilter named Debby Brown. She's been featuring some videos on simple fill designs - here's the link:
http://higheredhands.blogspot.com/
Just remember - you CAN do this!
Janet