That was my first reaction as well. You may get a shooter right out of the box. Most of us tend to go the custom route, so we assume all these additional things need to be done. But for someone just starting out, get the ADL in 300 WM and see how it shoots. If it will hold .75 to 1 MOA, then don't worry about fine tuning for accuracy. Just shoot out to reasonable distances and see if this is something you really want to get into.
After shooting some at 400 to 600 yds, you will begin to see the value of a nicer scope, a better rangefinder, AR500 metal targets, portable weather stations, etc. Then custom barrels, stocks, triggers, blueprinted actions, etc. The list goes on and on. Stay in the shallow end for a little while and learn all you can. Then if you like the sport and challenge, begin to selectively upgrade your equipment.
BTW, a Savage works just as well. Probably better accuracy out of the box, but less aftermarket upgrades (although that is changing as well).