Obviously it depends on your mechanical ability, but installing the EX-flex kit was easy. It's just time consuming and a bit tedious, because you have to basically support the entire side of the trailer to unload the suspension so you can remove/install the new hardware. You need several jack stands - two to support the trailer frame, then one under one axle, and another jack stand/floor jack under the other axle.
It's a fairly basic job in regards to actual mechanical difficulty, but like I said, just time consuming. I would say if you are confident in changing brakes on a car, you can handle the job. I would give the kit 5 out of 5 stars, awesome design and really well built. I have no doubt it'll outlast the rest of the trailer. I did notice a little less feedback from the trailer while towing (5th wheel) and the contents inside the trailer are less inclined to move around, but nothing drastic enough to warrant replacing your suspension if it's not worn out. The bolt holes on my original equalizers were really starting to egg out and were in sad shape.
