@NikNik
With difficulty! 
For me, My OCD takes two forms.
1. An unpleasant thought or image that I simply want to not have in my head, that I try to ignore or suppress, depending on how I am going, sometimes I can move on and forget about it. Often I can't and it dominates my mind, the thought is the first thing I think about in the morning and the last thing I think about at night for months on end. It causes me great anxiety and a feeling of being trapped and hopeless.
2. A specific worry that I try to dispel or answer through elongated rumination. Again sometimes I can dispel it and move on. Often though it leads to a panic attack and into a deep depression and self loathing for months.
There are a bunch of different themes that my Obsessive Thoughs have. Religious ones, particularly fear that I will go to Hell, existential ones, "I am completely alone, all of my experiences are my imagination and not real". Also thoughts of harm coming to people that I love, or worse of all, the thought that I will harm someone that I love.
The latter is the hardest one of all. It goes something like this "What if I go mad and hurt someone that I love", "why are you having these thoughts?" you must be a psychopath to think such things" etc. It becomes a thought battle inside my head of trying despirately to prove to myself that I am not a pychopath.
@NikNik wrote:
Thanks @Tim_H for the insight
@Ngunjima you mentioned the popular culture perception of OCD. Would you be open to sharing abit about your experiences? How you would explain your experience of OCD to a friend perhaps?