I've purchased all but my source used. I've turned over my system twice buying used gear at a fraction of the new price and never had an issue. My advice buy used locally i.e. how far you are willing to drive so you can test drive the used gear before purchase and pay a return visit if needed period, amen. Now I'm a jersey guy so I'm in a predominantly urban/suburban setting which makes this process easier. Know the brand up for sale and only buy gear with a good reputation for quality and performance. You may not get the brands you crave but you will get great gear nontheless.
A cautionary tale for you. As a recent college grad I bought used Adcom gear, (highly recommended), many decades ago and for a third of the new price I might add,and Snell c2 mk.2 speakers as well. First day I attached bare speaker cables to the used Snells and the Adcom 200 watt amp turned it on and woops I shorted out the amp as my bare speaker wire hit both of its terminal's lesson learned don't use bare wires it only takes one thin strand of copper to crash your amp. Lucky for me Adcom was located around New Brunswick NJ a short drive from home. They told me to bring in the amp with some donuts for payment and fixed it while I waited. I had that gear for 40 problem free years! Sold it just to try something else which was a used a Technics integrated sug700 and Canton 9k reference speakers both were just a couple of months old and for a song. I was aware many audiophiles are a well healed, obsessive, and demanding turns out all good attributes for bottom feeders who don't have the denero for high end or even mid fi gear or who are Scottish (which is my case).