When taking Macro shots in the open air, I use mirror up and a tripod so as to avoid camera shake.
The problem with this is that when trying to focus the image via the screen rather than through the viewfinder, the reflections, even on a dull day can make it very difficult. On a sunny day it is impossible.
I think that I have now found the answer. I have bought a Hoodman 3.0 Hoodloupe. It fits over the screen and has a focusing ring just like a telescope. You wear it round your neck and when the shot is composed, you can pop it over the screen and get a perfect view to help you focus the camera.
You can see some of my macro shots in the wildlife and flowers sections of www.photographs247.co.uk