Safety glasses You really cannot be too careful with your eyes. When you are trimming the ends off component leads or have your head close to something you're soldering, it's more than possible for a bit of metal or a splutter of hot flux to hit you in the eye. You can obtain a pair of safety glasses from pretty much any hardware store for just a few dollars.
A lot of my projects use development boards that have 25 mil square wire-wrap pins on a 0.1" grid. I like to insert these into a perf board and then use good-old 20th Century wire-wrap to connect them up. It's quick, easy to fix errors, and easy to dismantle to re-use the boards in other projects.
Solderless breadboards are also great for quick projects, but don't expect them to stay intact if you have cats :-)
Of course, many of us have a deep-seated belief that you can never have enough tools.
I frequenly will have two or more of the same type of tool. I was recently asked if I had a staple gun and when I replied that I had two (a manual and electric), my non technical friend just cracked up laughing. I didn't see the humour.