First off, might just be some grit in the seal, get a seal-saver or .004" feeler guage, and insert it into the dust seal, past the fork seal and wipe it around a few times. Often this can dislodge what's causing a minor leak. Cheap fix, if not.
If you want to do it yourself, it's really not very hard. Follow the manual, there are numerous youtube videos on traditional forks that will give you an idea of what's involved.
You don't need any special tools really other than a fork-seal driver, and you can make one out of PVC, or Rocky Mountain ATV has the Tusk brand for $30 something.
I'd rate it a 5 out of 10 for difficulty, easy if you've got some basic mechanical skills and decent tools.
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