Maintenance Upgrades...

Its around 45,000 miles and its almost time to start upgradeing the reliability of small parts in the G-RIDE. I just ordered Hose techniques silicone vacuum hose kit in red and plan on doing that myself because it comes with a manual. but i have no idea how to change the plugs and properlly tune my engine i plan on getting magnecor wires and ngk iridiums , and then chromed steel flexikool radiator hose. Would it be hard to drain out my cooling system and change the hoses and refill ive never done a cooling system flush. Anybody have any suggestions, tutorials? The only way to get it properly tuned is how? i dont have any major upgrades so what would be the options here? Or in this situation should i just be better off going to my new performance shop?