Welcome back Kyle! After that trip, KP will be a cakewalk
I would like to hear about your caddy experience also if you took any.
At the Old Course, I played with a trip of Americans from Wisconsin. One of them had a very good caddy (notably caddied for David Gossett during the 1999 Walker cup) that helped the rest of us out with lines off of the tee. The same trio was out with the same caddie earlier in the day but in different wind conditions, so it was interesting to hear about how the caddie's advice changed with the weather.
At Kingsbarns, I played with a handicapped individual that was driven around the course in a cart while I walked. That caddie also assisted me pro bono and was very useful in picking out putting lines (especially the 10-footer I drained for eagle on the par 4 6th hole!).
Mostly, I used "stroke savers (yardage guides)" that were always available for a few pounds if not included in with the greens fee. It was also quite helpful getting paired with members who were keen to assist without being asked.
Of the courses I played, caddies would be most useful on The Old Course, Brora, Muirfield, Carnoustie, Gleneagles and the Castle Course but I found the stroke savers were all I really needed.