The toolkit is definitely not an ‘end all be all’ solution for any style of game, but more so a helper to get you started on a grid based game. The great thing to remember is that you have full control to change or override anything you want within custom functions, and this toolkit gives you the start/examples you need.
There is quite a bit to catch up on as far as macros and functions go; but there are many helpers that can do what you are looking to accomplish already built in, it will just take a bit of time to get accustomed to it. For your example, there are 3 ways you can located a unit on the grid depending on what you can input, what is need as a return value, and what you are going to do with that information. To get the location on the grid based on index you can use the ‘Index to Vector’ macro or from a transform vector ‘Vector to Index’ macro from the Grid Manager BP. If you need to know which Tile Index or Faction the Unit/Pawn is currently on, you can reference the Grid Managers ‘Pawn Actor Array’.
Stick with it! It took me a few weeks to get an almost full grasp of what is all in the toolkit and how it can be used to customize a game. All I can say is that you will be glad you looked through it, there is a lot to learn and absorb. 