UK Visa Application Assistance - Tier 2 (London)

Hi all,
I need some help with a visa application for the UK - Tier 2 dependant.
I am considering to hire a professional to help me with this, but I find it very hard to choose one only by judging their websites.
Have any of you been in a similar situation/process and were you successful? Could you recommend someone by experience?
Thanks a lot!
Mauro.