I had done this on a Toyota engine of mine before. Might want to inspect the cambelt and tensioner while you at this. I read on the mkIV manual to press/tap the cam seals in all the way using a dolley or SST of Toyota. As mentioned above change those flat washer seals that are under the cam cover bolts. No need to remove the front caps unless you want to remove the old seal easier but then dont forget to apply the seal packing under the cam caps liberally when replacing them. Back on to how I do them, I apply red Loctite sealant, its the one in the white bathroom silicone looking applications but a smaller size. I apply this to the edge of the cam seal and then use the correct size socket for the outer rim of the seal. Place the seal in by hand to help it at first with alignment and then gently tap it in. I did the same on my oil pump when I replaced that as well. Difference is here, once the seal is in 3/4 way, use a small size 10, 3/8" drive tube socket rear, and gently press on the edge of the seal flush as you maneuver the socket around the diameter till it sits flush with your oil pump. You could use something else, as long as it is flat and strong.
Out of curiousity, do you have a tool to break the crank pulley bolt loose? I use a cheater/breaker/power bar to undo that using the starter method while in neutral but the ignition chords must be removed as well as the injector plugs and give it a tap of the key or two till it comes loose