I always carry a spare set of belts in the back of the car....
and seems like the driver side belt is the breaker.... I have yet to see the smaller belt brake....
I like to run with the cover fronts off... yes, and even behind the crank pulley...(no cover).....
This makes it a quick change when they break..........(non-interferance motor....) so no covers... for me....
but, if you have covers on.... you have to loosen the crank bolt.........
I have put a nice socket on there. with a long bar on it.... get it up against the frame...... remove the coil wire from distributor.... and
on quick turn of the ignition key,,,,, usually loosens the crank bolt...
you are using the turning of the motor to loosen the crank bolt.....(just don't hold the key... just a quick turn of ign. key..)
Also..... changing the tensioners........ makes for a nice quiet motor......... Do the water pump while you are there.