On every caliper their will be a bleed nipple, you will need 8mm spanner to slacken the nipple
Then put a rubber pipe on the nipple & put the other end nto a bottle!
You will need some one to pump the brake pedal for you so the old fluid squirts into bottle
When clear fluid starts commin thru, tighten bleed nipple & move onto next caliper
Make sure you keep an eye on your brake fluid level as it will drop & require regular top ups during the process!
Hope this helps!