Valve Seal Replacement?

What all is involved in replacing 4.6 valve seal gaskets? It looks like timing chain and cam and all have to come off? I got the air hose for spark plug compression and valve compressor I took valve cover off but now looks like cam and timing chain have to be removed? Help???
 
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I am by no means a Mod motor specialist. So hopefully a few that are will chime in. But every time I’ve ever had to change valve seals-the cylinder heads where sitting on my work bench
 
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I don’t like the sound of that lol
Best video I’ve found
View: https://youtu.be/bXKcXr8Ii3o


And here’s an older thread on this forum with some decent info

When you tackle this job, make sure to take tons of photos and do a write up, and of course post it on Stangnet :)