Hello Julia
I done MBB1, first year psych subject, in my first year first semester. It was okay, not too hard and its more about cognitive side of psychology. The assignment is also really easy. All in all you can easily get an H1 if you study well for final exam.
Then for second semester I decided to do 2 second year psychology which were cognitive psych and personality and social psych...biggest mistake in my life!!! they where much much harder that MBB1 and you should really understand concepts well! my 2 lowest grades from first year came from these 2! some of the topics where interesting specially in personality psych as it is more into clinical psychology.
If you just want to try to see if psychology is a career option for u or not,start with MBB1 and then MBB2. taking second year subjects in first year at least for me did not end up great : )