I do medical/pharmaceutical MR smoggie. At the moment I do mainly analysis, interpretation and report/presentation writing. I've not done much interviewing/moderating because I've been at home with the children all day and couldn't fit it in (although I have done a bit of telephone interviewing from home). I've also done a bit of proposal writing and guide design. I do mainly qual but am just starting up on a quant project actually - I'm just putting together presentation charts from tables.
I'd say you can probably get work without having personal contacts but it is much harder. I've got 2 clients that I got by just sending CV, but my key client is the agency I worked for and tbh, they've kept me busy for the last 5 years (it's very rare that I have a period of no work). One of the clients sends me less work but it's just because they are a much smaller agency and use freelancers less - anything they get in I usually get though - I think I'm about the only person they use for anything more complicated than transcription (for which they can use general typists I guess).
With my main client, I get much more involved in the projects - I go into the office for meetings and am treated as part of the overall project team and have been named as a team member in proposals. I've been asked to attend final client presentations adn to go overseas to work on projects too (I have declined though as a key reason I left the company was that I didn't want to be doing that any more!)
This is obviously because they know me though and with other clients it's more that they just send out the work, I do it, send it back and they do the rest.
I love it though - it's great to be able to do it from home and still be there for everything the kids need without the stress of leaving the office behind, earn half decent money and also 'keep my hand in' and remain up to date on medical and pharmaceutical developments.
If you want to know anything else, feel free to ask!