NOTE NOTE NOTE This plugin is no longer in development. For your node needs, check out http://forum.kerbalspaceprogram.com/threads/47863-0-22 PreciseNode by regex
Unzip to your game folder as usual and run the game.
How to use
The node tool is automatically enabled when a maneuver node gizmo is detected.
The key you use to cycle through maneuver nodes is by default O (as in Orange). Pressing this key opens the last node you had open before it closed. If no node was open before, it opens the first node in the node list. If a node was alreadyd open, it opens the next node in the list. So if you accidentally close the node you were editing, just hit O to bring it back open.
Using the window, you can adjust the universal time when the node happens. Pgd stands for prograde (green buttons on the node gizmo), Rad stands for Radial (blue buttons on the gizmo) and Nml stands for Normal (purple buttons on the gizmo). You can edit the node values with your keyboard or by using mouse. If you use mouse, you should tick the "Keep open" toggle to ensure that the window doesn't close when your node closes (KSP feature, no can do!). There are four buttons: -, a number, + and S. Use - and + to adjust the number. Use S to flip the sign of the number (positive/negative). Click the number to add it to the node.
The window also displays total Delta V required for the node and you can quickly change patched conics mode. Changing patched conics mode is very useful when you're trying to create an accurate encounter. You can set camera focus on the destination planet and change the conics mode to help you visualize the encounter.