I did have to try several different ones before I found one that hadn't been taken. Apart from that, however, I didn't find the process problematic in the least.
What I would say, though, is that it would be useful if it was at all possible for the system to warn new registrants if a name they have selected is extremely similar to one already in use. This has caused some confusion in the past and indeed we currently have some regular posters who have almost identical usernames, the only difference being the use (or not) of an upper case letter.
Should women have equal pay and opportunities?
To think that London, or anywhere else for that matter, does not belong to any one demographic