How on earth can I get my dog to allow me to cut her nails?

I have a 4 year old Basenji mix. She is the sweetest thing in the world, except when I or anyone else tries to clip her nails. I've had her since she was 7 weeks and played with her paws and nails from the very start just for this reason. Her nails are super long and sharp (even after walks everyday on the cement) They are clear so I can clearly see how far to cut is too far. At the groomers it takes usually 4-5 people to hold her in the right spots to get those nails clipped and on average it can take 30-60 minutes. She just fights it terribly. No amount of treats or soothing helps. I cannot afford to take her to the vet and have them sedate her for a couple hundred bucks when she needs those nails clipped. Is there something I can do or give her to calm her down to allow me to cut her nails????? I've tried the dremmel type products as well (pedicure, etc) and that was even WORSE!!! I even let her play with it for like an hour before I tried. There was not a chance that thing was getting near her. I am at my wits end, they are long and sharp and I have bruises all over me from her nails - playing, snuggling or just when she wants my attention. When she plays with other dogs, sometimes they end up getting hurt as well. PetSmart has given up on me and her. I just don't know what else to do. I just can't believe that such a well trained, sweet dog, won't let me just give her a little clip! Please help me and my precious baby get those nails trimmed.