Don't go to a shop because, you'll pockets will run dry.
One of the three things will happen to you if you go to the shop/dealer.

#1, they'll fix one thing and break/f*ck up another.

#2, They'll fix what you want and MUCH MORE, essentially replacing parts you never asked to be replaced, end result being a gargantuan bill.

#3 They'll do nothing but blindly throw parts at it all day.

I've broken things while DIYing, but it was careless mistakes, you won't destroy your car while working on it.

The great people on here will walk step by step if need be, they did for me when I replaced my lifters. My 300SDL was the first car I worked on.

Your 300D is a bit easier then my car.

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1998 Ford Escort ZX2 5 speed - 279,000 miles My Daily

1992 Mercedes 300D 2.5 202,000 - Pure junk
2000 Mercedes E320 Black - 136,000 miles - Needs repair

Don't forget to grease the screw and threads on the spring compressor.