This unit is great for the beginner. Using lots of lube gently insert and then by gripping the handles, gently squeeze open whilst trying to relax. Once you feel you've reached a comfortable position, use the thumb wheel in order to maintain the position.
Once relaxed, gently squeeze the handles again in order to open further. This unit can be used either by yourself or in a medical scene with another person.
At this price its a bargain!