Have you ever been some place and you were unprepared? You were unprepared for what was about to happen? You thought you were ready but reality came and told you that you were not? Well that should not be too much of a surprise. We all have been caught unprepared at times. Yes it is best to be as prepared as possible, but even that can get a bit ridiculous! That perfect in-between is what you are likely aiming for. Like if you are going to be flying on an airplane with a baby. You will want to pack extra clothes for the child, more diapers and wipes than you may initially think. It would be wise to pack an extra shirt for you in case the child spits up horribly or a diaper blow-out lands on your shirt. Do what you need to do in order to make it through the flight.
Just like with things like traveling with a child, you want to be prepared in whatever venture you are on. If it means having basic stocking items in the kitchen when cooking, so be it. Or with electronics, have staples (basic office supplies) so that you are prepared and can fix and/or build things! Look at http://www.networkselectronic.com/Products/PistonActuators.aspx to get piston actuators as a regular stocking item for your workplace or hobby at home.