"This is what you need"

When you aren't as able as most, you are more dependent on other people for things or completing them which isn't just an irritant that can cause you to lash out in frustration in itself but also a cause of tension between you.
What isn't said I think needs to be is inevitably it does alter the relating dynamic by virtue they have what you need and can't do that they can use as lever and equally you may feel you have leverage because they're your means getting something done so it is easy to form an abusive relating pattern.
But it's not just that it's also how that person slots into the role helping you realize the idea you had that can become a point of contention too.
Speaking as a person whose always been disabled, our normal expectation is in discussing it with someone, they work with us to do it the way we wish unless that's not possible in which instance we'd them to talk though other suggestions reaching agreement on the way forward.
What can happen though is the person runs with what they feel is what you need, taking control not just of the help but also of the very idea itself imposing their ideas in place of yours  then threatening to walk off leaving with an uncompleted job if you even question such attitude as the one looking for help.
It's as if at that point you just became invisible no longer permitted to have any say about some things in your lives and that easily leads to tensions that others soon pick up on.
I think if you spot this early on you need to bring this up as it can easily cause issues.