The phrase "a bit difficult at" is correct and usable in written English.
It can be used when describing a situation or task that is somewhat challenging or hard to manage at a specific point or context.
Example: "I found the math problem to be a bit difficult at first, but I eventually figured it out."
Alternatives: "somewhat challenging at" or "a little tough at".
Weather considerations mean that each character tends to have a great big furry hood, reflecting sunglasses and beard, making it a bit difficult at times to know who's shouting.
I know it will be a bit difficult at first.
It seems a bit difficult at first, but with a bit of practice you can have a nice spot of cooperative fun.
"It's a bit difficult at times, with pitches like they are, to get the ball down and pass it like some of them want to and, sometimes, we're our own worst enemies - we play ourselves into trouble.
Different kinds of behaviors (Fogg has a grid of fifteen!) are characterized by different balances of these three, but the basic dynamic is that if motivation is high, a user is willing to do something a bit difficult at which their ability is low given an appropriate trigger.
"I've enjoyed the job so far, it was a bit difficult at the start, the first game you're thinking 'What have I done here' - you don't sleep, you're staring at a window at night thinking 'Where do we go from here,' but you brush yourself down and say 'Right, this is what we do from now on'.
You had to go through one to get to the other which was a bit difficult, but at least we were together until at the end of March Ian Jolley told us that he was moving out of the cottage at Northey that he was living in and if we wanted it, it could be arranged.
"The process was a bit difficult because at this time Bobby Fischer had lost his passport," the lawyer, Arni Vilhjalmsson said.
"It is a bit difficult to say at this early stage.
Like many prescriptions, it's a bit difficult to decipher at first glance — though not because of poor handwriting.
"I think it is time to explore our history even if it is a bit difficult or uncomfortable at times".
