I am 77 and I do all my stuff.
Break the nut loose before you start start the job! ( I used a breakover bar and a 12 foot galvinezed pipe. Came right off with my 240 lbs on it.
You need a drift pin punch and a heavy hammer - mauler type as well.
might consider changing them both at $60 each while you have the tools out and your already filthy!
Have fun with your SVX!! We all do!!!