My "experience"....and I use that word loosely!
In 2010 I built my first. (Doesn't count the TC Hawken kit back in 1980...not a "real" build I freely admit!) My 2010 build was a 50 caliber flintlock pistol. I followed nothing, read nothing, and used some internet pictures and attempted to follow some advice from this forum. What I was going for was a 50 Cal Flintlock that I could use in Pa. for the flintlock season hunting. The use of a pistol was a fairly new regulation then.
My pistol was big, ugly, clunky.....but it shot fine. I listened to some advice here, but frankly didn't get all the knoweldge that was attempted to to be conveyed to me.
Then in 2018 I decided to take a stab at rifle building. The first piece of advice I listened to was buying the book "The Gunsmith of Grenville" from TOTW and I read it. Reading that, along with reading post on this web site really opened my eyes to what it takes.
So, I decided to build a Leman style rife as that looked to be the easiest one to build. And it was a learning curve!! Now, know that I have a disability that has zapped strength from my left arm, and gives me sudden onsets of fatigue. So, the most I could work at any give stretch was 3 hours....with breaks. But I figured I have 300+ hours in my Leman. No patchbox. The rifle is just fine for me and I've taken one doe with it.
The build of my rifle then had me looking hard at my pistol, and being objective about it, I tore it down and re-did it to look and feel more like an early 1800 flint pistol. It's not perfect, but I like it and with the revised trigger, it shoots great!!
So, if you have the time to commit to a much longer process, then buy a TOTW or another providers rifle kit. Know that up front there are a few things you really need to know. For example, pre-carved and pre-inletted are two different things. The bad part of a pre-inletted stock (even tho it may appear to be less work....and this does not include a Kibler) is the carvings may not allow your pieces to match up. And you go thru more work "fixing" than if you just got a pre-carved. BTW, I purchased a pre-carve stock and still had to remove 50% of the wood.
So, as the old saying goes, "time is money." If you want to learn...or "trial by fire" then buy a kit. It's not a bad thing to do.....just know what your getting into. If you start today and apply yourself, you may have it done by fall. If you want to spend less time yet have a very nice build....then buy the Kibler.
MHO