If it needs a new clutch at 35000 miles you have some serious driving technique problems - very unlikely in my opinion, but maybe possible if you like hill starts in 3rd gear!! If it is a clutch I'd be having a chat with Mitsu and see if they will ante up some pro rata as thats appalling for 35000 miles.
If the master cyl is leaking, pull back the boot and have a look, lot of liquid drips out then you know there's a leak and it needs replacing, your clutch/brake fluid resevoir should also be getting low on a regular basis. Fix the master cyl before even discussing a new clutch with a mechanic, it will probably fix the clutch problem.
Its not a difficult DIY job - bit fiddly maybe.
For a DIY job, about 2 - 3 hours, competent mechanic about 3/4 to 1 hour.