Work on a site: updating WP to a new version, fixing doubled pages in Google search and “Contact” form, adapt the site to different browsers.

There are the details: 1. To update WP from 3.5.2 to new 4 version, considering Qtranslate plugin and its specification with WP, which makes problems with updating. 2. I've installed new plugin WP SEO ( Yoast ) instead "All in One SEO pack" and now I can't open some pages on the site, specially a ”Contact us” form. I can’t send messages from the contact form to my email. 3. For some reason, I have a lot of double pages in Google search ( I see one content on my site's page, my friends see the old content on the same page, where I have corrected mistakes already). 4. To adapt the site to different browsers. I don't need to get this work done in 1 or 2 days . :) Good work take time . P.S. IF this work get done very well, I will ask about a technical support of my site on permanent base. In this way we can work with my site step by step with monthly payment. :)