Hold your cup with your right hand while supporting it from below with your left hand. Using both hands is considered to be polite etiquette in Japan. Drink the tea without slurping or making any noise. Avoid blowing on the tea to cool it down. Instead, set it down on the table to let it cool.
Enjoy the tea, based on your preference and taste buds. Ultimately the tea should taste appealing and delicious to you, whether you prefer it a bit bitter or more muted in taste or sweeter or milder in flavor. It's important to drink a cup of tea that suits your palate.