Micro and Heme compose the bulk (or even all) the image section of the practical part of the CP exam. Therefore, familiarity with micro "morphology" can have a significant impact of your score.
Go on atlases and pictures as much as you can. I used the image pages of Henry (very good) as well as the image section on Koneman (the last part of the book..I bought the book just to for this section). I believe that any atlas of micro will work very well.
Most of people concentrate on bacteriology and forget parasitology. You might get a lot of pictures of ova, adult worms, bugs such as ticks, lice..etc So don't forget these things. Refer to the items of Microbiology on the RISE lists for the previous years..and you will get a lot of "high yield topics" from these lists..this is essential to do well on micro.
The image questions are either spot diagnosis (identification) or a clinical question related to the picture. Therefore, it is important you read and have background before you jump over the pictures in your study.
The micro chapter in the CP compendium is excellent. Read it thoroughly and combine it with an image book as described above.
The written part of the micro is not that hard but might be tricky. You don't want to miss easy questions such as the classifications of organisms.
Going over questions will also help. If you have time to go over the Harr book, that's fine. However, the book is too technical (designed for technologists) but has many nice stuff including images. So becareful to separate our style of Qs from theirs'.
If time is not enough for you, just going over the RISE list of items and reading the topics in full can be enough. The lists for all the years are long and you think it might not take a long time but it does. Going over the micro Qs in the CP companion while reading the compedium is also good. Keep Harr book till the end, if you have some time.