Small Engine Troubleshooting Problems? Ask a Mechanic Now.
What exactly are you wanting help with in replacing the Head Gasket? it is an easy job. Just remove all the head bolt and remove old gasket, make sure to clean area well of all old gasket. reinstall head. Make sure to check the valve clearance once all is reinstalled
I would personally check youtube for video instructions. There are several the I am sure. Even if it is not the exact same engine as yours, the process is the same for all engines. You will need a feller gauge set, possible torx bit T20-T25.
Putty knife will scrap old gasket off easiest also