If vibration causes nuts to constantly work loose, first add a lock washer, if it doesn't have one. Or, if there is room on the bolt, use two nuts, tightened toward each other so they lock solidly. You can also try wrapping monofilament fishing line under the nut before tightening it on the bolt. Another possibility is to try wrapping the threads first with the teflon tape that is used in plumbing.
Magnetic tipped screwdrivers are handy for keeping a hold on smaller screws, especially in tight places where your hands can't reach. You can magnetize your screwdrivers by rubbing a magnet down the blade five or six times in only one direction. To demagnetize, rub the magnet in the opposite direction.
Keep an extra tool set in your car or truck. Think of it as an insurance policy against road emergencies. You'll be glad they're there when you need them.
Read and keep the owner's manual for all of your tools. They often contain vital info you'll refer to throughout the life of the tool.
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.
Several methods are available for dealing with screws that tend to vibrate loose on covers of equipment such as chainsaws. One good fix is to remove the offending screws and wrap 1/2-in.-wide Teflon tape around the threads and then screw them back in. The tape will hold the screws tight, yet will allow you to remove them when necessary.
If you plan to refurbish a major shop tool or other equipment, take some photos before you start. They possibly can save you some head-scratching during the reassembly process. Take pictures from a number of angles, and take close-ups of areas where you think you might have some questions later. The more complex the machine, the more photos you should take.
Keep a tiny pencil sharpener in your nail pouch to keep a nice sharp point.
Saw blades should be stored separately. Keep each blade secured between two pieces of plywood, fastened together by a nut and screw that goes right through the center of the blade. Blades that are chipped, bent or in any way damaged are discarded at once.
A sharp pencil is essential for making accurate cuts. To keep the pencil point sharp, rub it back and forth a few times against a sanding sheet. This will give the pencil point a chisel shape which is excellent for marking.