Robin nesting on patio

A pair of robins have set up home on my patio in some ivy, I don’t know what stage they have got to with nest building etc. as I don’t want to disturb them by nest hunting. They are both coming and going and the male is occasionally feeding the female. My question is, what can I do without disturbing them? I have two cats which I’ve now locked in, and will have to keep locked in I’m guessing until any young have fledged. Should I avoid the patio completely? My patio doors are my only access into my garden so I’m a bit stuck as I will still need to do gardening jobs. They seem to have set up home about 8ft from the doors. Can I do normal gardening chores close to the nest, such as lawn mowing etc? I’m scared they will abandon it.