I got the shuttle shift. The dealer had a good price on the shuttle and after I tried it out I was fine with it. I do think the HST would be easier to use immediately. For me the steepest learning curve is the loader and learning to use it in conjunction with the shuttle shift. Either one individually is simple but using them both together and doing it well will take me a while. I have an affinity for mechanical things and have no issues with a clutch and gears but I have absolutely no experience with a loader. I absolutely love it but will be very cautious getting to know it.
Yes you never want to rush it. Using them in sync isn't too bad, HST is deff easier to run but after using my tractor for a few months I was given the opportunity to run a 6130 I believe it was. 130hp JD
It had a loader with a manual transmission but it had A, B and C range gears 1-3 forward and reverse with a gas pedal to rev the engine and give you more or less speed, I didn't have any issues running that one and loading round bales onto my trailer. Once you get good at yours, all the big stuff runs the same, they just have a lot more displays and buttons lol.
One thing I did with that helped was used the clutch and break at the same time in order to creep up to the trailer smoothly and not run into the trailer, as soon as it was where I needed it I hit the breaks and pushed down the clutch slowly not to roll backwards while at the same time the loader was being dropped with the round bale so I didn't hit the fender on the trailer IDK if that's generally how it's done but it worked for me, then I put in reverse gear and did the same in reverse, rode the break a little incase I had a issue with the bale spear hitting the trailer.
Working the loader is now second nature to me, I have had a lot of manual cars and trucks so a clutch is no issue, after awhile they sinc up nicely as long as foot controls are ergonomic.
This one had breaks on the right, gas on the right, clutch on the left.
F, N and R was left hand, loader and all gears right, it was easy enough to figure out with no teacher, the farmer just left the keys in it and said to load up what you want and leave the money in his barn lol.
Like you, I didn't grow up around tractors, mine was the first larger tractor I have ran, the FEL was a first for me.