The short answer would be "With some difficulty". If you are an instrumentalist, ask yourself, how would I practise if I didn't have my instrument with me? That puts you, more or less, in the position of a singer.

You are learning the pipe organ, and need one to practise on. Assuming you do not have access to a church with an appropriate instrument, you will need one at home.

"I couldn't practise, because there wasn't a piano where we were on holiday." My response would be "And your point is?". I get mystified looks. If they had at least taken their sheet music, they would have been able to do something.

This page is a note about how I teach sight-reading. I've posted it as a matter of public service. Usual disclaimers about no responsibility taken if it doesn't help you, or makes matters worse!

It seems to me that there are two problems with ornaments: technical and visual. The technical aspect is not just that students can't get their fingers around ornaments on the piano