I’d recommend you look around, search on google, and get as much info as you can before you part with any money. I wrote a post on choosing a professional cv writer, with some criteria on how to choose one you’re happy working with: No luck getting interviews

Let me know how you get on!

Clare

Leaving aside the question of age / seniority of position, the biggest challenge career changers face is proving they have the right combination of experience and skills to do the new job effectively.

From your post, it seems that you’ve already been working in your new field for a few years, so emphasise recent achievements in your CV – the ways in which you have made an impact in your new field. How have you increased business, streamlined processes, lowered costs etc? What have you achieved that has made a real difference to your company? If you highlight these in your CV (rather than focussing on your previous career) you can show potential employers the value you bring.

You probably don’t need to account for your entire working life on your CV (normally going back 10 – 15 years is enough) but you can have an additional section on your CV (Additional Professional Experience, for example) where you give concise information about your previous career. Again, focus on the highlights of this, rather than on your duties and responsibilities. If possible, choose those that most closely tie in with your present career.

Have a look at a previous post on writing career changing CVs for more tips and advice.
http://www.jobmarketsuccess.com/2009/07/5-tips-for-career-changing-resumes/

In your covering letter, you can address the question of why you’re applying for a junior-mid level position. You can mention that you have changed careers, and that you are now ready to move into a more senior role, in a company that offers growth potential.

Hope this helps
Clare