Hello,
I have had my struggles with K2. The best thing that I found is use Firefox then download Fire Bug. Use the hover selector then go to the element that you want to change/inspect. Once the correct div is selected click it. You will see in the bottom right of FireBug the css attributes for that selection. You can then "dummy" edit them live.
Once you have it positioned to the way you want it hover over the link on top of that block of attributes for styling and it will show you exactly what stylesheet it is and what line its located on. From their just simply change it on your stylesheet and re-upload!
Also if you can edit the K2 php files directly to move the block elements around. I used K2 as a property listing engine and rearranged the entire K2 structure at
www.stmartin-vacations.com. Just select a property to see. K2 is magic!