Why do it ? It is very satisfying to know when and what to do and to be able to it yourself.
I am self taught.
I have replaced rotors that were scarred and that were untrue. If there is no problem, I leave the rotors.
I have replaced one caliper that was not working.
Lift all four tires. The only way I would bleed the brakes is all four, one at a time.
Tie off the caliper with tie wire so that it is not hanging by the brake line.
Force in the caliper with a C clamp and a block of wood. I open up the brake line for this step and allow the brake fluid to leak out. I try to close up the brake line as soon as possible to avoid losing brake fluid and not allowing an unnecessary amount of air into the line.
For breaking open the brake line in the above step, and for bleeding the brakes at the end, the bleeder valve could be opened and closed.
I have found it a waste of time to mess around with the bleeder valve. They are small and the bolt head always strips out. To push in the caliper and to bleed the brakes, I open the brake line by loosening the bolt that connects the brake line to the caliper. It is a large bolt and works easily and quickly.
Time is important. If you make mistakes and are running back and forth to the auto parts store, your vehicle will stay on the blocks longer than needed.
I never use grease or shims and have not needed them.
My frustration with brake shops stems from my experiences with them when I had a car with brakes that did squeal.
Have plenty of brake fluid on hand when bleeding the brakes. Start the engine. Have your wife or your daughter pump the brakes. Open up the brake line while the brakes are being pumped until all the air escapes. Tighten.
Check your brakes for softness as well as you can while it is lifted up, because if you find the softness after it is back on the ground, it has to be lifted again which is a major pita.
Replace the pads before the rotors get any abuse.
How to know when the pads need replacing?
It is supposed to be when the pad thickness is the same as the pad holder. Some wheels like mine allow visual and feel inspections.
On the front pads I took off yesterday, the driver side pads are a little thicker than the pad holder, on the passenger side the pads are a little less than the holder. I don’t like to see that.
I had some rear brakes where the pad wore down to the rivets or whatever that held the brake pad on the holder and those had gouged up the rotor.
Oh.
If you do have a little vibration in the brakes, in certain situations, and you feel it happening, adjust your brake pressure. Try more or less braking until the vibration stops.