General meditation questions

1. What if I’m struggling with meditation - will I not be able to do the program? 
2. Is it OK to use essential oils, heating pads etc?
3. Can we use it spontaneously if feeling anxious? 
4. Could colouring or playing music be the same as meditation?
5. What do you think of binaural beats? 
6. What do you think of Yoga Nidra? 
7. Are apps like calm and headspace ok?
8. Is it okay to do neurofeedback during the program or is it best to do that after the 3 months?
9. What if having unpleasant sensations?