Learn to tie a couple of basic knots. Surgeons knot, clinch and improved clinch are enough to get you started. Also, your reel and line should come with a little booklet on knots. Add a big smile. Serious fly fishers don't wear bright colors, or white hats on the water.
Fish can see very well.
They spook even easier. Keep colors to earth and muted tones that blend into the natural setting. Layering is fashionable and downright practical. Weather conditions can and do change over a period of fishing. You will be more successful if you are comfortable.