I agree, it takes me few days of noodling with any new stuff to get a objective opinion.
My ears are not so good to make verdict in few minutes.
Also, what sounds great in shop/bedroom will not sound good in band settings.
That's why I usually read a lot on internet forums, buy used and often sell after some time playing with it.
Ditto on all this, though I don't go thru a lot of gear. I only made one quite spectacular instrument upgrade after having my Craigslist starter bass for a a bit under a year.
So I know what you mean ... i was playing for about 6 months when i began the search for my first
real bass
I'm not a virtuoso now, and i certainly didn't show any signs of being one back when I was testing out all different brands at a couple different GCs & Bass Northwest (RIP) for 2 months straight. Many of the employees got to recognize me from coming in 1-3 times a week to try out what was new ... one even commented on how my playing was improving since the month before
Overall they could tell I was serious about learning this instrument, and I even knew a few things that a couple GC employees were just guessing at, from being a research junkie (which lead me to TB to begin with

.)
In the end I bought from Bass Northwest because not only did they really care about me finding the right one for me, but they had nearly a dozen high end Spectors (which is the direction my TB research narrowed me towards.) And though i didn't much care for the smaller & more rounded bodies, when I saw that Bird shaped Forte-X hanging on the wall (they had not one, but two of them!), i knew before even hearing how awesome it sounded, that I wanted to learn to play THAT bass

Several years later we're still very much in love.
Take your time, just play scales, and maybe bring a strap with you to try it standing. You don't have to play loudly when testing, either. Some wanker in the guitar section will cover you, most likely
