Our 2002 ML320 is having starting problems.
In the last week it has been failing to start 1st time. The starter cranks but the engine doesn't catch. It usually starts OK on the 2nd or 3rd try - but there is a definite smell of burning in the air when it does start, which I suspect is insulation in the starter motor.
It's a Bosch starter so I figure at 88,000 miles it's on borrowed time - I've already replaced the alternator.
Once the engine starts there's no stalling issues - so I don't suspect the CPS although I plan on changing it at the same time..
How dificult is it to change the starter on one of these ? I've changed starters on older vehicles, are there any problems with obstructions etc ?

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1990 300CE-24 (Gone but not forgotten)
2002 SLK 32 AMG
2002 ML320 (Gone)
1995 E320 Cabriolet