2007 Ford mustang. Hard to get in gear but no grinding??? Any idea of problem

 

This is like saying "Doctor I have a headache. What's the diagnosis? You need to provide more information than that.
How many miles on the car?
Does it still have the original clutch assembly?
Are there any hydraulic fluid leaks? Check clutch fluid level in reservoir.
Is it difficult to engage all the gears?
Is the pedal feel inconsistent, soft, or spongy?
Does the engine rpm rise suddenly when you hit the gas pedal while driving with little or no acceleration?