Easy to get out, remember shocks compress. Jack car as much as it will let suspension down, undo ends of said shock using 2 tools to prevent rotating the shaft in the shock. With ends free of nuts grab the shock and muscle it out by compressing, moving body end free of its mount then down. To lower the risk... With shock out check it in the yard before buying. Lean on it to compress and let off. Watch how easy/hard it was to do, how fast it compresses and uncompressed on its own. If this is easy to do or slow on the rebound the shock is worn. Then lean on it half way and do some fast pokes to emulate light washboard road, if these are not sloppy or too easy, don't rattle... You have yourself a shock that may or may not be as good as the one you already have in the car. Sometimes you can read a date code stamping, which is a clue to its mileage. When you take them home take the first shock out of your car and do the same tests on it and decide which is better, if yours are more difficult or firm leave them in. No risk. $20 and at worst you get a bit of a workout.

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Cheers!
Scott McPhee

1987 300D