Replaced battery in mid-2009 13" MBP
5 - 10 minutos
After 2 years and more than 500 cycles, the battery time on my 13" MBP was 1-2 hours. It was time to replace it.
I'd searched for replacement battery before on websites shipping locally in Sweden, but only found lesser capacity Li-ion batteries. When I saw that I could order an actual replacement, I did it. I arrived two days later in Stockholm - great!
I've opened my MBP before so it was no big deal. It's easy to scratch the bottom plate if the phillips screwdriver slips.
I wouldn't pay extra for someone to do this for me.