There's no easy way.

Incapacitated doesn't mean helpless, or that a creature's defenses are down.

Incapacitated creatures are aware of what's happening around them, can move normally and interact with objects, and can oppose attempts to move, grapple or disarm them.

Grabbing an incapacitated creature still requires a Strength(Athletics) check opposed by the creature's Strength(Athletics) or Dexterity(Acrobatics). Depriving them of something they are holding would also be resisted by their Strength(Athletics).

Incapacitated creatures aren't especially vulnerable to intimidation, persuasion, or anything else. Their AC isn't lowered. And so on.

The Hypnotic Gaze feature, however, has the specific additional effect of also charming the affected creature; that means that some interpersonal interactions can be attempted (by the enchanting enchanter) with advantage. But that also wears off as soon as any damage is dealt.

Yes.

The condition states everything you're not allowed to do:

• Actions (which also prevents Bonus Actions, per PHB p. 189: "anything that deprives you of your ability to take actions also prevents you from taking a bonus action")

• Reactions

Moving is none of those, so you can do it.

Keep in mind, though, that most effects that incapacitate also cause other conditions, such as movement restrictions. For example, hypnotic pattern says

While charmed by this spell, the creature is incapacitated and has a speed of 0.