It's not hard, but very time consuming. I would be a -1 for having the heads rebuilt. E7TE heads actually last just find, and really don't need much machine work. If you are going to spend money to have the stock heads rebuilt, you are half way to buying better aluminum heads. I would recommend checking the heads for straightness. All you need is a straight edge and a feeler gauge. If it's your first time doing the head gaskets, give yourself a full weekend to do it.
Kurt
It is a good bit of work, and will be pretty big undertaking if you are not confident in your skills to do it all. Very doable with time and patience.
As for rebuilding the heads, at the least I would have them checked by a Machine shop. It cost me 75$ a head to have new seals, valves cleaned, seats cleaned, heads resurfaced etc. 125$ is pretty far from getting aluminum heads in my book (which are closer to 800$ for a USED pair), if you can afford a head upgrade now is certainly the time to do it.
That's about half way to a rebuilt head. Usually a rebuild comes with new valve guides, new valves and springs, and a valve job on all the valve seats in addition to the things you listed. The standard price is about $300/head. You can get a pair of Thumper E7s starting at $599. If you are going to have the heads rebuilt, you might as well order the Thumpers and get the port work with it too.
Kurt
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