Another aspect to this, aside from expectations about what the end result will be, would be how cost prohibitive it would be in most cases.
A complex build like a scale Saturn V would take dozens of hours. I value my free time at about $100/hr. Sure, that's more than my job pays me for my time, but not THAT much more. When you look at time as a resource... some goes to job, some may go to family, some goes to sleep, what's left over for most people is PRECIOUS.
For example, I can do most handyman stuff around the house, and prefer to do lots of things myself if I have skills/tools to do a quality job. But there's a lot of gray area where I COULD do it but maybe I don't want to sink that much time into the project and it would be worth it to hire it out. I use $100/hr as my rule of thumb. If I could do it in three hours (=$300 value), but I can hire it out for $250, I hire it out.
Folks with more time on their hands certainly might have a different equation, but even at $10/hr... that Saturn V is gonna cost hundreds. There's also the risk ... what if the person building it screws up the wrap and needs to buy a new kit or some such? Making sure there is an agreed-upon process to resolve that case is critical.
My recommendation is start with something less ambitious and develop the skills that eventually will let you tackle the Saturn V. Keep the V on the back of the build pile for a while; eventually you will be up to it.
While I never really cared much for scale models, I got to be (I think) a pretty good builder for a while, but then the press of other things going on in life took the wind out of my building sails and I slowed way down. I'm nowhere near as good as I was at my peak. I'm trying to get back into the building form I once had. I'm finishing up an Asteroid Hunter build, and have made several stupid mistakes on it that I never would have done, years ago. But, I learn from these mistakes and hopefully won't make them next time.
Don't overly criticize your build skills. Learn from each build, do the next a bit better, and mostly have fun!