Need some help and encouragement. We pulled the pan off the motor today to replace and main seal and reseal the oil pan and timing cover.. all looked good EXCEPT there was little pieces of plastic in the oil pump screen. I could not figure out where they came from, then it dawned on me... valve seals. Hardened and broke apart. I HAD NO PLAN TO REPLACE THESE.
And seriously considered to leave them and live with a little first start smoke, but I know the right thing to do is replace them, especially now with the motor out.

How hard are they to replace? What tools do I need? How much work involved?i have to pull the rockers. Compressed air into each cylinder to hold valve, then compressed springs to pull springs and drop in new seal. I then have tore adjust all the valves right?

This is a job I have never done before. Am I over my head doing it myself?