What am I missing

[JuggernautOfWar]

I'll help ya out.

To use wire cutters (I assume you mean in Chasing Shadows), simply walk into the section in the fence which you must cut. Note this is a predetermined spot which is marked on map.

To use Dynamite, first make sure you have some in inventory by pressing I by default, then hit the gear icon in the controls area. You will see a picture of dynamite if you have any in your inventory along with a number on the dynamite icon to show you how many bundles you have. This is also the same technique to setup mines correctly. Although with mines I find it much easier to hold shift while placing mines for more precision.

Hope this helped.