It's hard to say if the classes are difficult to manage or not; it all depends on the individual. I feel if you put the work in, do all of the required readings etc, then you'll manage just fine. My advice would be, don't overextend yourself, but in the same token, don't spend too much time between classes.
As for whether this is a good area of study for the years to come, I feel like there are a lot of further options for someone who completes a Bachelors degree in Psychology. You may have to complete further study if you want to work in the area of Psychology specifically, but have a knowledge of Psychology/how people think/why people act the way they do can only be helpful in your future, both personally and professionally.