If I go into a shop to look or pick brains, I am very upfront in saying that I'm a student in no position to buy, but could I test out a few bikes? Then I'll buy something, generally. Tubes or nutrition or a pair of gloves...something so they get at least some money for their time. I do have an idea of what I want/need in a bike (unless it's a mountain bike; then I'm useless) and what fits me, so the amount of work that the shop has to put in is somewhat less than if I were walking in with no idea what size bike I needed. If that were the case, I'd offer to pay at least something for their time.
Most bike shop employees understand that it's a major purchase, and at least you'll be able to get a cursory sizing, and an opinion on unisex vs WSD if the shop employee is paying attention, maybe ride a few bikes and start getting an idea of what you like and don't like.



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