Hard for me? No. Hard for you? Maybe. Changing the PSU and GPU are very easy. Everyone should be able to do that. Unplug old parts, remove, plug in new. Case might make it difficult but those are simple. The cooler can be an issue. Some need LOTS of pressure to secure it, or use a complicated screw/nut system. Depends on the cooler. If you are good with your hands you can probably figure it out and it won't be to bad.