OPS is pretty easy to get into. The wait times for interviews can be long, but much much better than RED. The actual interview is pretty easy too imo. Just make sure to read through the interview prep.
Yeah, just make sure you read up on the study material and understand it all well enough. I believe they hold interviews during the weekends and the wait times vary throughout the weekend but for me I had to wait about 3 or 4 hours before getting an interview.