Once you are in the company they go out of their way to help you pass the endorsement and training. The system in the EBA is followed, however you can expect additional training if you need it. Obviously at a point they have to cut their losses and let you go, however it is rare as it is expensive for the company. The initial training system is designed to pass you, there is no money in failing you.
Once checked to line, do many pilots have difficulty with cyclic checks?
A cyclic is inversely as difficult as the preparation you put into it. If you study and think about what's going to happen BEFORE you go in then you are not likely to have an issue, if you don't study then expect a difficult ride.