Goldenbear Jeez little, 'it is a very basic interview skill that you "sell" yourself' - you don't say??? Is using correct grammar a basic requirement to?
I believe the phrase "selling yourself in interviews", while not grammatically entirely pleasing, is a well known phrase in modern parlance, particularly in the workplace.
As for freelancing, people love to offer you a few hours here and there, but I found it too unreliable to be a realistic substitute for full time work. However it does have its uses in that it can be a way back into work following a gap, and I didn't turn it down. This is how I got my present job.
I'd also be careful Goldenbear that you do not stray into the area of soliciting for the charging of legal advice, unless you are a qualified solicitor with a current practising certificate. There is a notorious "grey area" between HR and employment law, and one that the Law Society cracked down on recently.