Hammering a nail close to the edge of a piece of a board may cause it to split. This problem can be solved by using the nail to open up the split, them filling the crack with glue. Wipe off any glue that runs over. Remove the nail, then clamp board as the glue dries. To avoid these splits in the future, use a drill to bore a pilot hold.
Clean obvious obstructions such as newspaper, leaves, etc. from around the exterior of the unit.
Brightening up your workplace will make work easier and cut down on mistakes and mishaps. To free your benchwork of glare and shadows use two 48-in. tubes in a utility fluorescent fixture, centered over the front edge of your workbench, 48 in. above the work area. For extra light to see details, consider portable halogen worklights. Tripods for these lights makes it easy to put light where you need it. Also consider clamping lamps with a 50-watt reflector bulb near task areas like vises and drill presses.
It seems that for some jobs, you need three hands to get it done. Your pliers can lend you that extra hand. Use the pliers to grip the wire or small piece you need to have held. Then wrap a rubber band around the handles to maintain the grip while you complete the work.