I'm a DIY'er to my core, but the above is going to cost you $200-$300. I bought all my parts like you, took it to my gunsmith (Alamo Precision) and they screwed on the pre-fit for $25. Said headspace was dead on. That gap in cost was just too high for me.
Other than torquing on the barrel, I did all the other work. One thing worth mentioning, the Hawkins BDL I used in my anti action was NOT plug and play, rounds would not feed at all. The spring tension must be tuned (grinding/sanding off the edges to make it more narrow and less strong), and the spring must also be positioned correctly, then staked.
I haven't bothered bedding yet, gun shoots lights out without it so far.