One way of making a glide computer be more conservative about arrival heights is to enter a value for bugs.

How conservative you should be setting out on your final glide will depend among other things on how safe the terrain is on the way and how likely you are to find more lift on the way if needed.

I have no problems with the idea of using electronic aids from an early stage, but

Sense check what they tell you
Follow where you are on a paper map in case the electronics let you down
Learn your toys thoroughly when you are not flying
Know your settings, database, polar, safety height etc
Remember the idea of the electronics is to let you spend less time with your head down, not more