I personally just gravity bleed the system several times. Any hose that is snug to the bleeder nipple will suffice. You can purchase small bleeder wrenches that fit over the nipple and allow the attached small wrench to turn the nipple, a 7mm, but you can just connect a hose and open the bleeder with a wrench.. Be sure your connector hose runs up from the nipple then down into a disposal container for the fluid. I just open slightly and give it time for gravity to do all the work. I have been using this technique for decades on my street and track cars with never any issues and never needing anyone to help me.