i did my own front fenders and wheel wells about 1.5 years ago
reasons where when i was undoing the old fenders from the old wheel wells, they where fused (rusted together at the bolts) and undoing took chunks out of the wheel wells
working at my own pace it took me almost a week a side (only have like 2 or so hours a night) but the satisfaction you have is greater than paying someone, plus you learn how to get it done
i as well are more mechanical than body work, but i gave it the old college try. as for the rear quarter... ...i can't weld my way out of a wet paper bag, so when doing the rear, i think i may just pay someone