It is interesting to think about the role of responsibility in the practicing of religion by oneself or in a group. @Brickjectivity mentioned in a later response that they feel it is easier to be a loner, but when I think about the issue of responsibility in particular, it is hard to view it that way. If you are doing things by yourself, that's taking on a huge responsibility. And a lot of work. You can't delegate tasks to others, you have to do all of it on your own. If you don't do something with your religion, nothing happens with it - nobody is there to pick up you slacking off. To me, that makes solitary paths much more rigorous and challenging than having a group to lean on for support. You have to be very self-motivated to keep it going, as nobody is there to mind yourself for you.
For me I would agree the solitary path is more rigorous because responsibility causes me great stress but for others the group path is much worse because tolerance causes them great stress. In a group you have to be tolerant to the groups decisions (challenging at times) and tolerant to the individual personalities (extremely challenging at times). I am more tolerant of others than I am myself so I see groups as easier.