I think your DS is copying daddy right now, he's see's daddy doing a 'good' thing successfully and with capability and wants to imitate. I can't stress how important language (lots and lots of it!!) is in developing your DS' understanding into these activities and responsibilities, eg, 'are you pulling up the blinds too? wow! you're very clever! WE have yo be careful, see like this (demonstrates careful manouvere for the blinds), see all done, *clap**clap**pat on the back*, lets go do ...... now'. I also see this as a stepping stone to him becoming more independent, autonomous and helpful, and who wouldn't want those things for child However, it can be very frustrating and hard work when LO's are headstrong and WANT to do more. It's still being helpful, but requires that language to explain that 'that bin is for next time, we only put one bin out today, here come help me pull this weed/smell this flower'. Distraction will be your best mate, it is mine anyway!
It also requires support, and in that I mean bringing the adult back to reality when they get to that point of being 'over it', and we all go there (my DH is frequently in this place!!). Your DS is only helping and trying to be invloved, he is very clever and is learning how to do it on his own.

I hope my post makes sense, you know me pretty well now anyway and know what I mean (even though we're different-we do get each other), keep surfing the toddler wave hun and dishing out those patient lentils to DH haha! Couldn't help it!
xx