You’re right, ‘doing’ is the same as ‘trying to do it’. The difference is that we do one with confidence and the other with doubt, convincing ourselves that we might not be good enough.
It’s like when we speak: We can doubt and question everything we say, frequently using words like “I think”, “maybe”, “I’m not sure”, etc., or we can simply state our opinion and have the confidence that we can, and will, evolve if our opinion changes.
It’s a difference in living passively vs living actively. If we live actively, we will embrace and always be ready for change wherever and whenever it may come.