[greedylizard]

As a child I solved this problem by rotating my paper 90° to the right and writing “down”. Still do it til this day.

Although it gets awkward when someone wants to hold the paper for me while I sign. I have to gently tug it away from them so I can turn it.

[fm2606]

I turn my paper about 45 degrees.

I have the same problem when people want to hold the paper for me to sign.

[sova]

You can write "down" with your left because immediately above your hand on the page there's no hand to "drag behind." I had to think about your sentence for a while. (It might just mean I'm not very bright.)