Building strength with your fingers takes alot of time and effort of getting use to things.Youl go through alot of callouses along the way.....lol as you try to build the basics and foundation for learning the instrument.It's just a part of the game that we all go through.My only advice is to keep at it a little everyday untill your fingers build the natural strength and inclination to grab those certain things your having trouble with.Keep at it and good luck!