Re: reverse problems --- grinding noise
The correct procedure both forward and reverse is to quickly "snap" it into gear. You quickly move the control handle either forward or backward about 1/3 of its travel. The grinding you are hearing is the drive dogs rattling against each other. Continued abuse like this will result in worn drive dogs and popping out of gear under power.
You may also need to adjust your shift linkage. Check for other threads that explain how to do this.