Pretty easy job, just messy with brake fluid getting everywhere. Just be careful with the brake lines that feed into the master cylinder, they are pretty soft and easy to strip. Make sure not to cross thread one like I did
You might want to bench bleed the MC, or at least use your fingers to bleed it.
You'll be pretty pleased after you install it and get all the air out of the lines, your brakes will be far, far more effective.