Great. Have fun. A test ride is a good idea. I can't imagine the Enviolo hub and belt drive work much differently on different bikes. IDK
Do you know about getting a Priority Current at Costco Next? Very good value and I just checked they have the Shimano and the Enviolo in both colors and various sizes.
I've read of folks on here getting a Costco membership just to buy this bike since it's significantly cheaper - like 20% less.
I don't recall reading anything about it being difficult to put together while I was doing my research. But finding a shop that can help with adjustments and such is a good idea.
I managed to put together my Samurai without difficulty. I didn't have to open the box because the entire end was missing
The bike was damaged so they built me a new one - I arranged to have it sent to a shop - less chance of damage in my rural delivery area. Worked out well.
One can argue the advantages of getting a bike locally if you like the Turbo Como or whatever you test ride. Dealer networks and all that. Usually more money though.
As far as the Automatiq shifter, Evelo Omega comes with Enviolo Automatiq - not sure how that compares to Harmony. Evelo is currently having a big sale right now and they have a good reputation around these forums. I was very tempted by the Atlas.