If you aren't gonna use it often, it's better to pay someone to do it. The hardware is not expensive, but the software installation can be confusing/hard.
Your X can be coded remotely. If I were you, I would write down everything I want to be coded to the X and pay someone to do it in one shot.

EDIT: Agree with upallnight, Tripl3OCoding is legit. He can do it remotely.

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00 E39 DINAN S1 //M5 (82k miles)
06 E53 DINAN 4.8iS, born 2/18/2006 (126k miles) http://www.xoutpost.com/bmw-sav-foru...s-my-dslr.html
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01 360 Novitec Spider F1 (26k miles)