As for the sentiment, I agree whole-heartedly. We all have our own wool to carry, ha ha. And there is nobody who can carry your own wool for you, literal or metaphorical.
Lazy is the little lamb that won't carry its own wool.
(Latin: Est piger agnellus qui non gestat sibi vellus.)
The source for the proverb is Philosophia Patrum by Julius Wegeler (GoogleBooks). The poster is made with AutoMotivator. The image is by A Roger Davies (Flickr).