I have been using DCS for about 18 years, but mostly just to occasionally run trains for many of those years. I have 2 TIUs and added Wifi to each one a couple years ago. I do have AIUs for switch and accessory control - don't let them intimidate you - they are just glorified switches (that just happen to require good bifocals and even better fine motor control to physically install LOL). In the last year, I have added TMCC control through Base1L.
I am a technologist at heart, but I still run into those cognitive lapses we all sometimes have. Reading Barry's book in the past 6 months was a great refresher.
My best advice is to try any parts of it you want! There is always someone here on the forum to help. I try to help where I can but am usually late to the dance. Since its basically a toy, its really built to be manageable by most anyone.
On a side note, Barry was very gracious in helping me in the forum during my early foray into MTH and DCS. I was so saddened upon my return to hear of his passing.