Within Europe I'm convinced it's getting more difficult, and is hampered by the Flight Planning Software not being able to pick up on CDR's and not seeming to understand one way airways...!
Outside of Europe it's far easier.
We have access to the IFPS internet application, which is great if you keep getting REJ's - you can look up the ACK'd route for something on a similar path and copy it.
All operators can get the access - see their website
www.eurocontrol.be.