In all honesty, you should do fine.
I've played a boomkin main since early TBC, and I have yet to this day had a single keybind. I most often use a combination of clicking (usually reserved for extra actionbar spells), and using the number line above WASD for my main spells. Without sounding too arrogant, I can fairly say I've done decently in every expansion. (apart from TBC perhaps, I hadn't learned about gems/enchants until Wrath!
In fact, I'm often in the top 3 in raid finder, and same among any raiding guilds I've been in, and that's certainly without amazing gear.
I haven't ever used keybindings and I'm doing great and am perfectly happy that way.
You should be fine, especially if keybinding isn't working out for you.