I recently needed to make some frames for some of my daughter's paintings. I considered buying new frame molding for the project but that's just not how I like to do things! This was a great opportunity to clear out some of my scrap wood from my scrap can(the scrap wood can will be another tip)
I pulled out all the leftover 2x4s I could find(no treated wood). I ripped the 2x4s down to 1x1 1/2 on the table saw. Then using stop blocks on my extended miter saw fence to insure the frame sides and tops were all the right size. I cut the miters. No problem so far, been there and done that so many times I don't even waste brain power thinking about it! BUT! I didn't have enough miter clamps or time to make any jigs for clamping. This is what I came up with.
I nailed a small block of MDF to my workbench. Then I spread glue on one of the mitered parts. I placed it along the block of MDF and put the other part along the other edge of the MDF. It was really easy to hold the joint together and keep my hands safely away from the brad nail gun. Anytime you're using tool you should be very careful. I got a great deal on a Full size Framing nail gun because my little brother shot himself in the hand. He spent about 10 hours looking at the nail sticking out of his hand before the Doctor finally pulled it out! Be carful! And if you do get hurt don't blame anyone but YOURSELF!