First, welcome to the forum. I think you'll find much good advice here.
As far as getting out of sales situations, I personally think your "out" for the luxury car shop was not all that good,. Having done many car shops, from Chevys to Porsches, I always have a competitor make/model as my out. Even if it's a $20k car, my story is along the lines of this is likely the last car I will buy, I want to make sure I'm getting the right vehicle. Wanting to compare another vehicle is always a good, safe, out, although you need to be prepared for the salesperson to tell you to take their car to the competitor's dealership and do a side by side comparison [I had that happen one time].
As far as consumer goods, you want to check the reviews at Consumer Reports before you make the final decision. In this particular situation, I would have said something along the lines of, "I asked the salesperson to not get the vacuum because I was still comparison shopping."
This is a learning process. With time the outs will become more comfortable.
"To be persuasive we must be believable; to be believable we must be credible; to be credible we must be truthful." Edward R. Murrow
Thou shalt not steal. I mean defensively. On offense, indeed thou shall steal and thou must.--Branch Rickey
Edited 1 time(s). Last edit at 03/25/2016 12:51PM by GMooneyhan MBSC.