Will I lose my customizations on upgrading to PRO GP?

Hello Tom and the rest of the GP team,

Thank you for creating such an awesomely simple theme and your ongoing support on practically every possible issue related to it under the sun!

I recently moved my healing blog from Blogger to WP, and after trying several other themes, finally discovered GP! Loved it!

I currently only have a blog section, so using the free version of GP. But once I have enough content already published on it, I would like to add a SERVICES and WORKSHOPS/COURSES section. Would also like to move all the blog posts under a dedicated BLOG tab on the menu bar.

Earlier, I was thinking of switching to a ready-made coaching/therapist theme, (like Zelus maybe) but now I love GP so much, I want to continue using it, if possible. I have 2 questions:

1) Is it possible to make that kind of website with GP Pro?
2) Will I retain the CSS styling I have already done, even after switching to Pro?

Thanks and regards,
Kads

The page I need help with: [log in to see the link]