That is a simple way with visualization.
Another easy method is to take a cleansing bath, you can soak a tub treated with some epsom salts and lemon juice for a bit. If you're religious, a purificatory prayer could be a good addition to it. Otherwise, just chant and visualize all the negativity flowing out. Wash in a downward motion.
You can then pray/chant for prosperity. Praying or charging a fruity or sweet scented lotion is a good easy method to making a prosperity rub. Start at your feet and move upwards.
Now, you protect yourself. You can do the visualization method above, pray for protection, create a charm (search the site for a 'witch's bottle' for an example), you could even put salt and black pepper in the four corners of the house and in your shoes. Look into other apotropaic charms, there's a lot.