Extreme Blog Makeover

I'm getting bored and want a new blog design.  One that I don't have to copy and paste and check a thousand times to see if it's working and displaying my blogger awesomeness the way I want.  I have been quietly following stalking Holly's blog for a while, and absolutely love her and her super cute little family!  Her hubby has recently joined the blogging world here and also does blog designs.  After having done some research, ok I googled a few things and didn't like what I found, it seems that HubbyJack's blog design price(s) are very reasonable.  Unfortunately I am very new to this blogging thing.  Like new as in I still have the umbilical cord attached.  I am not tech savvy in any way what-so-ever.  Me so mart I can type up these fancy posts and get them onto the blog.  I can even occasionally get my pictures on here the way I want.  But...that's about it.  So, the following questions are for all of you blog experts out there!  Making my blog look more "official" rather than something K&K put together is something I really really want...but I want to make sure I have all of the right information before I take that step (oh and Christopher is an IT man and didn't think I had enough information when I was telling him how I wanted to throw money at Holly's hubby) so help a sista out!  I'm also not *limiting* myself to Hubby Jack's blog designs, but he seems the most reasonable so far and I have seen lots of his work and love it all!

1. Once the new blog makeover is done, will I still be able to post the same way that I currently do?
2. If I want to "add a button" or change a "tab" (just kidding, kinda, I can't even do that now) will I have to have the blog designer do that for me?
3. If I want to change out my hot "profile pic" is that something I can do myself?
4. Basically I want to know if once I hand over the reins to  this bad boy to someone else, am I going to have to constantly rely on him/her to make changes, or will I still have control over the "simple day to day" stuff? 
5. If you have had your blog redone by anyone besides yourself, please let me know how it has worked out for you.  Was the price right?  Did it turn out how you expected (or exceed expectations)?
6. I am clearly just getting started, so my number of followers is pretty much non-existent and I'm not even thinking about sponsors at this point...but if my numbers do grow, and I do one day in the next ten years have anything to do with sponsors...will that change the layout of my blog and will I need the assistance of an expert to set that all up?  I see all of yall's fancy sponsors and highlights in your sidebars but have no idea if you do that yourself!  Please don't judge me.  Help me :)
7. Does anyone else remember all of the questions I was going to ask?  No?  No one?  Damn.
8. If you have any tips/advice/hints/etc, please please please share them with me!  Unless you're going to tell me I should give up on my dream of having a successful blog, then I will just cyber punch you and ignore what you say!