I've theorized/headcanonned a "nurse" changeling... though "physical therapist" is more accurate. If somebody, changeling or no, has a malleable form, a PT can do the adjusting for them, so they can later do it themselves.

Which isn't clear without an example. So let's say... Discord, while fully capable of transforming himself and his surroundings, plays along. A PT changeling can turn Discord into a pony easily, but not turn a rock into a gelatin mold with Discord's magic. (At least, I assume not, but it's stuff I'm making up about a cartoon species, so it's more like I strongly suggest not.)

Changelings would be champions at PT. I like that headcannon.

I'm picturing a nervous Ocellus visiting the dragon lands for the first time, and deciding it's more prudent to show up in her dragon disguise.... only to find herself swarmed by thirsty dragons within minutes of arriving, much to her alarm.

Smolder had to smack more than a few snoots before they got the hint.

Inb4 that made them want her more because "fiesty"

They have excellent taste

Think Spike likes that form too?

hehehe dragon like what they want ^^'='^^

I have heard they can be pretty insistent.