Over the years I've done it all - including rebuild an engine completely. But there is a line we hope to cross in life. The line goes from having more time than money to more money than time. No - it's not always that simple, but there is a bit of truth to it for me. At this point in my life, the valve job has become complex enough that I don't want to give up a weekend doing it so at some point I'll take it to a dealer on Tuesday morning and have it back in time to ride Saturday. But most of the routine stuff I do my self still. I still change my oil on all of my vehicles and on the motorcycle I pull both wheels off the bike and take them to the dealer for tire changes. I also do all of the farkles myself.