Hey Amy, you can definitely do this and it sounds like you’ve got a great attitude to it! I wrote quite a few tips here, which you might find useful!
As I wrote in the linked post, make sure you work out the right about of calories for you because just having 1 Huel for lunch and 1 for breakfast might not be enough for you, or it might be too much. You just need to work it out. So head to that post I’ve linked to 
We’re not here to replace all your meals, especially not the moments you love and enjoy. You can fit Huel in wherever and to lose weight with Huel you don’t need to swap everything. The most important thing is building a good relationship with food, something you maintain for the rest of your life, not just a few months.