Originally I started with a pre-made PSK and then started replacing components with higher quality items, and looking at various other possible ways to carry items as I went along.

Then once theory meets practice, you'll be able to better judge what needs to stay and what can go.

Figure out what exactly you want the PSK to do (stand alone or EDC supplement only?), decide what essentials you'll need, then try out a couple different carry methods until you find something you're happy with