Web Writing Insecurities

I have attended only one ENL 623 class, but I am already overwhelmed.  As a first time web-developer, I naturally have some insecurities.  While the majority of my fears are tech-related, I find myself increasigly--and surprisingly--concerned about writing for the web.  

• Formatting guidelines.  There are so many rules I need to memorize, like the proper way to format lists, use boldface, or advertise hyperlinks. 
• Concise writing.   I worry about my ability to be succinct, yet informative.  
• Audience consideration.  I need to tailor my writing to meet the needs of Interent readers.

Writing is a process; I am not going to become a skilled web writer overnight.  Thankfully, there are plenty of web writing how-tos online, as well as competent writers in this class who can help me along the way.