It's not something that can be answered in a forum post. I suggest you google something along the line of "Aligning and balancing your chakras", as well as reading the abundance of information there is available in the site forums :)
Opening them doesn't exactly require much work but rather maintaining their condition does. Leading a healthy life leads to better internal environment.
I'd recommend you cleanse your chakras daily or if not once a week. The results of those are well worth it. Also, keep in mind that whatever is internal gets affected by our external surroundings. Chakra blocks can happen due to a certain area in our life that we need to work on, for example if I suffer from a root chakra block this can be due to an on-going financial problem.
well i guess and i hope that my post isn't that late much.. lol..
about opening of the chakras, you could use binaural musics (if you are not quite good at meditations) and after you have opened them, visualized them as vortexes spinning faster and faster (with their appropriate colors off course)..