Reddit reviews Cal-Hawk Tools Nut Splitter Tools - 2-Pc. Set

This will change your life.

Nut splitter

Try a nut splitter. Pretty cheap tool. Has saved me a few times.
https://www.amazon.com/Nut-Splitter-Tools-2-Pc-Cal-Hawk/dp/B0000AX88Q

Failure of the rebound axle straps is very common. Replacements that were made from poor quality rubber for many years compounded this. Many shredded when cars were jacked under the rear axle on one side, (which is quite normal) putting the weight of the car's rear on the opposite strap when the other wheel comes off the ground. I understand they are improving however, so the good news is that they are inexpensive because the vendors sell so many... As an alternative, many have gone with a nylon strap manufactured by Russ Koester, known as Strapping Lad...
https://sites.google.com/site/strappingladshop/home
I have them on my 'B's and have been very pleased.

A useful tip for that replacement process: Unless the nut holding the strap and washer on looks and feels like it will spin right off immediately, don't even try to put wrench force on it. It will sheer off the stud instead of breaking free. (You will notice that everyone sells kits to repair this because of this fact)

Instead, invest in a Nut splitting tool. Very handy for any classic car restorer. It's essentially a big chisel that you screw into the edge of a nut to crack it and destroy it instead of destroying everything. Then you just buy two new nuts instead of figuring out how to repair the mounting stud.
Looks like this Nut Splitter on Amazon

Yes, definitely do all you can with the engine in the car. For most of us, the procedure for pulling the motor involves removing it (and installing) with the gearbox attached and reconnecting the gearbox to the rear crossmember can be frustrating if you've never done it.

Take the normal precautions. Never turn an engine manually with the ignition key on. I usually disconnect the coil, just to be double sure that the motor will not fire when I'm cranking it over by hand.

My personal opinion is that the Astley book is not only a great resource for MGB electrical demons, but is one of the best automotive reference books I've ever come across.
Take a peek on Amazon:
https://www.amazon.com/MGB-Electrical-Systems-Updated-Essential/dp/1787110524

Modern, useful, thorough, colourful, well illustrated. Puts other manuals to shame. You may be fortunate and a ray of light will shine down on you and you'll be the one person who works on an MGB without any electrical issues...

But probably not. ;-)

See if you can get a hold of a nut splitter/breaker/cracker like this:

https://www.amazon.com/Nut-Splitter-Tools-2-Pc-Cal-Hawk/dp/B0000AX88Q