If you can't commit to a specific raid schedule then pugging is always an option, although it will most likely take a lot longer to beat a fight than it would in a static since you have to deal with a lack of communication, constantly switching players and heavily fluctuating performance.
Pugging is a bit of a coin toss, you can get an absolutely stellar party where everyone learns quickly and plays their job perfectly... or you can get a giant mess where people die to the most basic mechanics.