I have 1995 nissan pathfinder r50 motor,is there any problems that i should know about related to replacing blown head gaskets

I am sincerely hoping you get many more answers than mine.
What you should know is, be sure to get a "guarantee" good for about 10,000 miles on the work.
I have had several head gaskets replaced on various cars in the last couple of years. ( I maintain cars for friends & family).
My success rate has been awful.
The cars were repaired at certified and authorized garages, and I have had about 1/2 of the engines fail withing a few thousand miles.
God bless your efforts.