Tiger, if, like many, you stay out till after dark, it's almost assured.
The disappointing part is that a warm, low humidity, bluebird day means it's all concentrated to that last 15 minutes, and right as things get good it also gets hard to see. Cool, clouds, drizzle, etc. will make it start earlier and get fish rising earlier.
If you aren't used to the hatch chasing game the timing of it all is the biggest adjustment. That's not to say you do nothing all day. But in May, you're planning your day around evenings.