joomla 2.5 to 3.x

Hi;
I'm preparing to upgrade my joomla installation to 3.x.
I know that I have to uninstall gavick 2.5 template and install gavick 3.x template.
I have a lot of modules like Nsp, image show...Will I have to uninstall the modules and create them from the beginning? What is the simplest way to do the upgrade without losing module settings?

thank you

Hi,
Please do all those steps - step by step !
0) Make a full back-up (!)
1) Disabe then Uninstall old plg_gkextmenu plugin
2) Upgrade to J3.3.x
3) Re-install template to new version, for J3.x
4) Re-install all gk modules, I mean : mod_image_show_gk4, and mod_news_pro_gk5 - with versions for Joomla 3.x
5) Install plg_gkextmenu and enable plugin which you can take from gk_template_rest_files_J!3

You don't have to uninstall templates or modules.

thank you

Remember that not all plugins or modules can work with J3.x - but it's easy to check.
Just if you will see errors or blank page, just disable one by one, check.

ok, I tried it on localhost, there is something wrong with remember.php file, I disabled it but, now I get another php error. I have jreviews, jomsocial and gavick modules on the same web site.. I wish I had started wih J3.
I am working on it.
Thank you.

Nobody said it would be easy, that why upgrade service cost around > 150 euro, because all those problems that may occur.