JCL says it right, look at the tutorial, its quite good, then decide if you can tackle that sort of thing! there is a big difference between a "pad slam" and a proper brake servicing. the calipers should wear the pads evenly, if they wear differently something is not right with the caliper. check the slides and see. the difference between a DIY job and a pro job is the knowledge of the system. a typical diy'er might miss something like a sticking caliper pin, the job still gets done, but maybe a root cause of worn pad(s) is missed. If you're confident with your DIY skills go for it!
keep in mind that the brakes are the #1 safety feature that keeps you safe and not piling into the guy in front of you! I would NEVER cheap out on Brakes or Tires. (not saying i dont look for deals on high quality parts or tires!) Rock auto and FCPEuro, great sources for parts.
Enjoy

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2003 X5 3.0i (02/2003) sport package, Sapphire black metallic / Black Dakota Sport seats. compass mirror retrofit, trailer hitch retrofit, Prodigy P2 trailer brake controller installed, PDC retrofit, Lumbar support retrofit. heated rear seats retrofitted. Running boards retrofitted and subwoofer install in progress. 4.8is Brakes installed front and back. Bluetooth TCU installed, Rear Fog lights installed. Retrofitted reclining rear seat backs.