Make sure the cabinets and tops are all level before learning how to tile a countertop. If this first step is not taken, ceramic tile will be uneven and unattractive, no matter how well it is laid. You can remedy uneven countertops yourself or hire a professional to do it and save a huge amount of time, although it will cost more.
Carefully plan the layout of your tile since grouting and tiles that have to be cut will be very visible. Ideally, you will want to use full tiles and hide the cut ceramic tile as much as possible.