いたす
itasu
The word that brings your own doing down to knee height
The picture Doing your own work from a position below the other person's eye line, knees bent. The task is unchanged — only your body goes down. いたす lowers your own する to knee height; なさる lifts their する onto a pedestal.
Where the picture shows up in いたす
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walking ahead, still lower
私が案内いたします。
watashi ga annai itashimasu
I'll show you the way.
Walking one step ahead yet with your back bent lower than theirs, an open palm marking the route.
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the phone drawn down to you
後ほどご連絡いたします。
nochihodo go-renraku itashimasu
I'll contact you later.
The receiver pulled down low toward your own side as you dial.
One notch below します — standard in client and customer work.
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hands together to close a request
よろしくお願いいたします。
yoroshiku o-negai itashimasu
I look forward to working with you.
Both hands brought together in front as you bow and finish the sentence.
One notch below お願いします; fixed as the last line of emails and greetings.
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head down while you check
確認いたしますので、少しお待ちください。
kakunin itashimasu node, sukoshi o-machi kudasai
Let me check — please wait a moment.
Your head bent over the screen while one hand is held low toward the other person.
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setting a mistake on the floor
失礼いたしました。
shitsurei itashimashita
I do apologize for that.
What you did set down all the way on the floor, your head bowed over it.
All of it in one picture
いたす changes nothing about what する does and lowers only the body doing it. Walking ahead to guide someone, your back still stays below theirs; placing a call, the receiver is drawn down toward you. In お願いいたします that closes a request, both hands come together in front; while you check something, your head goes down; and when you take back a mistake, the whole act sinks to the floor.