One day while I was trying to physically force a sheet of 1/4" plate down so I could weld it in place, one of the older guys on the site said, "come here boy, let me show you how to work smarter not harder".
When I first got into ironworking, I started in the fab shop making columns, baseplates, beams etc. One of the challenges I faced was that when working with smaller beams, I didn't have a square small enough to fit inside the beam.
A great tool that everyone should have in their shop, is a 3rd hand. They are great for holding small parts in place so that the welder can tack them in place. They are very simple to make and you can build them as basic or as extravagant as you would like.