Michael,
Slow down, take your time. Remember? 
Think of it as an investment. The time you can invest now practicing well, will give you a good foundation which will pay off and is likely to speed up learning at later stages of your journey.
Taking time pressure now, will potentially mean that you have to revisit certain things later… and that might feel more frustrating than giving yourself enough time now.
I wonder where the average completion time of six to eight weeks stems from? I don’t find it mentioned anywhere?
Perhaps it’s also better to count in hours rather than in weeks, as some people can only invest some minutes or per day, while others can invest several hours per day.
Questions about Grade 1 completion time are asked quite frequently in the forum. Here is a link to a thread where @Richard_close2u gives an estimation how long it will realistically take to complete Grade 1, if you can invest half an hour (and later on 60 min) per day.