Before you eaualize, fully charge.
You should check fluid levels before you equalize anyway.
Don't equalize a sealed battery.
No need to keep the caps off.
You NEED to be there for all four hours.
Open the hatches.
Watch the voltage, amperage and if you have a bm use it.
Great time to piddle around doing other things.
Equalization is covered pretty well in most "How to take care of your batteries" texts.