Hey Rick. First of all welcome. This is great thread in general but wanted to respond to your question. "Do you need to nail the counting before moving on? Short answer for me is "No" and let me explain myself because this is sort of bad answer on this site.
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This site is fantastic and Griff's emphasis on counting is very important and it is good idea to put the time, effort and focus try to get the count right as best you can for things that you are learning
But.... I struggle mightily with the counting and with a bunch of licks at tempo it gets to be very much not fun. And basically I want to have fun.
There are two general categories of lessons here,
1)rhythm skills (strumming mastery, etc) and all types of lead stuff.
I would say that for the rhythm stuff nailing the counting is absolutely essential. IE you cannot use it if you can't count it.
But with the lead stuff, I feel there is some wiggle room. IE trying to get the count perfect is the ideal but I have employed plenty of licks where I never nail the counting but I listen back to them and they sound fine to me.