Finally got the replacement seal installed, and it did take only 20min to install completely. If your sunroof is correctly gaped to start with and you use a factory seal, you should have very little resistance on initial sunroof closure.
It will be a little tight the first time, mine closed 95% on its own, slap the perimeter of the sunroof and it should pop into place fully closed.

Leave closed for a couple of days longer if at cooler temperatures, and the seal will conform to the sunroof making full closure on it's own power possible.

Overall, a very easy job indeed, probably a 1 or 2 on the DIY scale.

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Stable Mates:
1987 300TD 310K mi (Hans)
2008 Jeep Grand Cherokee OM642 165k mi (Benzrokee)