Depends on where your leak is.
I am recovering from a bad one myself.
You wouldn't believe me if I told you...
If it's at the top you have to push/ pull the TC cover like 2ndGen said and that's a...royal PITA
If it's at the bottom you might get lucky with a re-doing the pan.
I whole heatedly agree with WristPin on the FIPG. But IMO, until you know you have cured the leak, I would use a cork gasket. Reason is, no let me just tell you what happened to me. I put an engine together, it leaked bad as soon as it ran. I tried to replace the TC cover gaskets in frame....oil pan had to come off. That didn't fix it, so all that labor was for nothing. I later removed the engine and FIPG the whole timing cover...haven't run it yet, but it required oil pan removal yet again. I was getting tired of getting that blank blank off every time I have to drop the pan. It's very labor and time consuming to remove that **** so unless I knew for sure where it was coming from AND I fixed it, I would use a cork gasket.
Two things important to my situation:
My truck is an 84
And I could not find my leak at 1st.
Hey this might help, and by all means Mud, if it's wrong speak up.
One thing I found useful for holding the gaskets in place for a in-frame gasket replacement, was spray adhesive. I was stressed at 1st on how I could hold the gaskets up, and slide the cover in at the same time. Just spry the gaskets, and place them on the block? I don't have experience with it, but it seems it wouldn't hurt anything?
Other than that, I would just run a bead where the block and head meet, spray the gaskets, put them in place. And install the cover and torque.