Depends on how complicated they are. Very simple orders with only one step cause no trouble as long as I am physically able to handle them (no, I am not taking the big vacuum cleaner from the first floor to the second. Way too dangerous with my weak and clumsy body!) However, if the order has many parts, it can get difficult. Two or three parts I can usually handle, especially if they're very similiar, like me needing to get certain three different ingredients from the fridge (assuming I find them of course), but if my mom were to say a lot of things she wants me to do during the day, like prepare the lunch, clean the lobby, trim the flower benches, feed the cats, fold the laundry, I'd be a little whoos what?
Those are all things I can do, but if the list is this long I'll be sure to forget something if it's not written down since I can't do it all at once. Also, there's the matter of being specific. How well does she want me to clean the lobby? Organize it better, wash it or both? When does the lunch need to be ready? I can handle all this at home (minus feeding the cats since I don't have cats) since I can do it at my own pace and my own way, but it's harder at my parents' house. Fortunately, mom seems to have finally learned that I have trouble handling various things at once and tends to give me one order at time.
The biggest problem comes if people aren't specific enough, though. Like the clean the lobby thing; how thoroughly do I need to clean it? Or if mom tells me to set the table, I need to ask her to be more specific, like if she wants me to put only the untensils on the table or should I start taking out the drinks and such from the fridge, too.
Preparing for a party at my parents' house is the absolute worst, though. They want my help and I want to help, but since I tend to not get specific instructions, they end up not liking the way I've done things... bah, if it's so important how the napkins are folded and what kind of pile the plates are in they should either just give me very specific directions or do it themselves. But if they do it themselves then everyone will complain about me not doing anything... why would I bother when my sisters tend to destroy all the process I've made since it's not done their way and then go and do it themselves.
We actually have a big party coming up two weeks from now since the youngest of us is graduating and this time I'm gonna make sure to keep my foot down: if my sisters start to boss me around on some task, I will abandon it immediately and tell them to do it since they know so much better. Doing this enough times should make them consider their words and actions twice sooner or later.