I loved this guide by Ása! She was super helpful in answering all of my questions (and I definitely had a lot). There is SO much to see in Iceland that it can almost be confusing to decide where to start, so having Ása to lean on for that reason and help with a personalized itinerary was super helpful too. I ended up deciding to do what she suggested in reverse (and go the opposite way around Iceland) but it was super easy to follow in reverse as well.
As with anything, I will always suggest to research the places on the itinerary yourself too to double check hours as things seem to change frequently - but otherwise.. purchasing this guide was definitely a great choice.