G'day Graeme,
Fork oil seals and oil change is no biggie. I'm surprised a m/cycle mechanic won't do it.
I just did it myself and have never done it before so you should be fine.
Check out 3rd page of 'The story so far' in the 906 forum. Forks are the same.
I started by removing the brakes, then speedo cable, then wheel, then mudguard. You will need to support the bike from underneath at front of engine as its front heavy. I then placed a drip tray under forks and removed the drain plug at the rear of the fork leg just up from the bottom. Then I removed the rubber caps at the top of the forks and unscrewed the nut underneath. This removes the air valve and now you will have a steady flow of shitty oil coming out the bottom.
Now you need to go into your toolkit and grab the appropriate sized Allen key and coming up from the bottom undo the Allen bolt. You will need to use the long end to reach. For purchase use a ring spanner as it will be tight. It's easiest to get this bolt undone while forks are on the bike, still in the triple clamps and still under pressure of the internal spring. There will also be less chance of damage to stanchion tube than if using a vice. The rest of the oil and the gunge will now come out.
You are now free to remove the slider (fork leg) from the tube (stanchion tube). To do this you need to yank down on the slider (as if its a slide hammer) and it will come off the end. It may take 2 or 3 goes coz you'll be afraid of damaging the base on the concrete
Then you can remove the dust seals then retaining clips and oil seals as Gerhard suggests. It would also pay to flush with metho at this point to remove any grime from inside coz if you don't, you will end up with stuffed seals again.
I then undid bolts of triple clamp and slid the tubes down so top of tube is free of top clamp then tightened bottom clamp (to hold steady) while cracking the top nut that had the valve in it. This prevents damage from a vice. You can also do this step while tube still in both triple tree clamps, but you have to remove clip-on (my bolts were rounded so I couldn't) Now you can unscrew the top cap but be careful as the spring inside will want to pop it out when it gets to the end of its thread. Now you can remove the tube from triple clamp.
Place on bench and remove spacer, spring and the rest of the guts making sure to keep in order so you know how it goes back in
. Clean inside tube with metho. LET THEM DRY. Then reassemble. I started by replacing the guts in the tubes then put the tubes in the sliders. Now slide the oil seal down from the top and into the slider. Use some PVC tubing as a slide hammer to push the seals home. If you use a screw driver you will damage the seal (as it is metal under the rubber and once it's out of shape, it stays that way and you need a new seal) Replace retaining clips then slide the dust covers over the top and down into place.
Replace bolt in bottom, and drain screws.
Now you have to replace the oil. For this the tube must be pushed all the way home into the slider. The cap, spacer and spring must be removed to do this. I then poured in the oil filling it to roughly 100mm from the top. I then inserted my home made oil sucker (see the thread I told you about) and sucked out unwanted oil. 180mm from top
perfect. Then pull tube up to full extension and replace spring, spacer and cap. To get cap tight you will need to put fork in triple clamp. Continue with re assembly. Don't fill with air, valves are for pressure release only
so this gives an alternative. 
