Mazda Repair Questions? Ask Mechanics for Answers ASAP
What is the concern with the brakes that leads you to wanting to replace the booster?
I'm asking this first, so you won't be doing unnecessary work.
I guess you are not driving it at the moment?
The pedal goes to the floor?
Some cars are not too bad to replace the booster, yours is about 2 hours.
I would do a brake fluid flush, and ABS bleed after the booster change.
I very much doubt whether you will find a step by step guide for this job, being a fairly late model car.
This is not a job for a non-technical person.
I would get Mazda's opinion before you go much further.
I hope my advice has been of assistance to you.
Do you need any further help?