As a beginner you should start with G and E notes scales on bagpipes, since they are easier to handle than D grace note. Nevertheless, if you know all the basics of the instrument functioning and music notes you can try even with D grace note.
No worries if you make some or a large number of mistakes in the beginning, practice and practice alone can help you perfect the skills. A better way is to start with lower A to work yourself up and then back down.
Ask your tutor to offer specific training for the D Grace notes scale. Generally the teachers who are trained musicians know some exclusive tips on how to handle D Grace notes on your bagpipes.
If you do not know much about bagpipes, music notes or specifically about D grace note scales, try to play in a group of people with similar skills level. You can get a feedback in this case and quickly improve in your skills.
Also, do not attempt to make any changes in the note, especially if you have the beginner's level skills. Changing the music notes can even increase difficulties for you. If you want a step-by-step approach, better follow a tutor or your own method for this, but do not change notes anyway.
If you are not sure about how you are going on with playing of the D notes scale, try to play in front of a senior musician. It is possible that you have been committing many mistakes unknowingly and if you continue to practise on the instrument with the same level of mistakes, you will find it very hard to rectify them in the later stage.
Searching about how the system of different notes in reference particularly to bagpipe works can help you use your imagination and learn quickly. This need is even more significant given that bagpipe music instrument is quite different from other similar instruments such as flute. So, playing the same note is easier on a flute but more difficult on a bagpipe.