I've sold a ton of things on CL without a problem including computers and tech stuff. Large items (freezer), need to be picked up at my home. As a single female, I just always had a friend around at the time.
Most times I meet people (from CL) at a public place for anything that fits in the car. The times I sold two different iMacs (one 21" and one 27"), I met them at the Apple store. The genius bar was happy to wipe and reset the iMacs for me (which I was fully capable of doing...just wanted to meet the buyer at the store)...the buyer saw it running there with the fresh start screen and money was exchanged outside the store in the mall area. Simple. I told the genius bar I was selling them...was buying a new macbook pro with the proceeds (not that day, but, later). Everyone was happy. Again, money (out of politeness to the store), should be exchanged outside the store in the common area of the mall.
The old macbook pro I had, the CL buyer wanted to give me a certified check. Still being leary and not being the fool...I met him at my bank...told the teller what was going on...she confirmed the check was valid and cleared...I gave the guy my computer.
I've sold iPhones, vacuum cleaners, rugs...the list goes on. Most people I've met at a very busy gas station with plenty of people. You shouldn't let a few weird things scare you from living life, millions of CL transactions take place every day. Just be smart...have others around.