[mbecke2]

I have 2wd 350 full size with 143,000 and I would like to change the tranny oil. I've never had it done before and the oil looks black. Ive read and heard many horror stories about blowing the transmission by not changing the ATF correctly. Should I bring it to a mechanic or do it myself?? Where do I start?? Is it fairly easy?? The tranny works fine but it shifts slightly hard into 2nd and 3rd, but not real hard. I certainly don't want to blow the tranny. Should i leave it alone??