Tail wheels on Trainers?
What airplane is it. It is really easy to convert it. Put a 1/4 inch plate behind the bulkhead at the front of the wing with triangle stock around it inside the plane, screw on a halco or equiv gear and the front is done. I like to use a Klett tailwheel bracket that screws on the bottom of the fuse or something close. Lots of companies make them. I like to run springs to the rudder control horn to drive it for steering if possible, or run a small push rod to it, or a wire from the rudder. One of my planes just has a skid, but I will probably change that. It came that way. Stearable is better.
Hope that helps some