Font sizing troubles…help?

I can’t seem to set my WordPress font size to my satisfaction.   I do like this Helvetica and this approximate size but don’t want it this bold.   Problem: when I make the body font smaller in my posts, the title size gets smaller too.  But my goal is to reduce only the body’s font size.  The size of the font you are now reading I am able to set under “Paragraph” in my WordPress’ “kitchen sink”  by highliting and applying  “Header 5” to each post.

Otherwise this is the default size of my posts’ font.   Arrg.

Does anyone have any help to offer?  Or wine to pour? 

Anybody seen my elbow grease?

I thought WordPress would be a lot easier.

I’m going to assume it’s the program, not me.  Couldn’t be me!

It’s most humbling to be starting over with this new blog but others have surely been through much worse, like, losing everything to a hurricane.  And having to eat tough steak.

I’ll shut up now and get busy.