My favorite model I built this week were a pair of pliers. I used the mirror tool with this model qutie a lot. I built one side, mirrored it, separated the pieces because they were attached after I mirrored them, and then moved the mirrored piece into place.
When building the pieces, I started at the bottom of the handle and worked my way up using the extrude tool. With the bottom area of the metal part, I combined a rectangular prism and pipe using the boolean union tool. That part was a bit challenging and tedious having to cleanup the distorted geometry and problematic areas of edges and vertices.
The model was 5 pieces in total.