Super easy

I just did one on my 89 d50 and went perfect... when you get the master cylinder it will come with instructions of how to bench bleed it first then install it on the vehicle and bleed the vehicle brakes.

when you are loosening the brake lines on the master cylinder make sure to be careful if they are corroded and when you bleed the brakes always do the wheel farthest from th master cylinder and work your way closer.

1989 Mighty Max 4WD 2.6 Turbo,Auto EFI...megasquirt! 4.62 Rear LSD!
1989 Mighty Max 2WD 2.6 5 speed slammed
1993 Eagle Talon TSI