You should never get set over the ball and then aim your putter face. If you do it in that order, you can easily lose sight of your intended line. Instead, aim the face down your line first, then settle your body into position.
I prefer old-world wines like Lafite Rothschild and Margaux.
Some players like to change clubs around the green to hit high or low shots. I play all of my short-game shots with my 54-degree sand wedge and change my ball position to hit it higher or lower. I think it's easier to learn one club than four.
The biggest mistake is trying to pinch down on the ball and ripping out a big divot, often hitting the ground before the ball. You'll dig up some turf, but you won't create much backspin.
Grip pressure - not mechanical flaws - is the biggest factor when you're nervous. You unconsciously grip it tighter, which keeps you from making a smooth swing with a natural release. Keep your grip pressure light, and you'll be surprised how much your mechanics stabilize.
Throughout my career, I've been sponsored by several different equipment companies - Lynx, Titleist, Callaway.
