Updating Drupal Core and Modules

I guess I thought updating Drupal and modules would be relatively easy … but, alas, it is not to be.
Firstly in updating the modules, I had to have the hosting company disable that mb_string thing. I got the modules to update but then Owl Carousel is throwing error message: Undefined index: settings in theme_owlcarousel_list()

Then I thought, well maybe its doing that because I have to update Drupal from 7.2.4 to 7.5.4 still. Reading the instructions is like me reading Chinese … can’t be done and I don’t understand a word of it. PLUS, this company’s server is a flipping MESS – files everywhere, html fils mixed with php files, I mean I’ve seen the homes of hoarders in better condition!

Is there possibly a video walk-through?


Drupal version: 

Source: https://www.drupal.org/taxonomy/term/21/feed