That sounds like a good plan. The RHS has a useful video and, although it is about trees much taller than yours, the principles are the same.
Photos need to be relatively small files, not straight from the camera. If you use the camera on the phone you can email the photo to yourself as a medium sized file and then upload it using the Attachments facility below the edit screen, not the ‘img’ tag above it; the latter is useful if you have images on a website. My photo is just a test!