Grounding in its basic form is connecting a bit deeper with the energy of Earth Mother. To really feel this easily I like to put my bare feet on the ground outside, on the grass or moss, bare soil works wonderfully too! Feel yourself growing roots as the plants do into the ground, they slowly move though the soil, around the rocks, deeper and deeper. Feel your feet they now feel firmly grounded in the Earth, now ask the rest of your body to connect with this grounding, and ask for it to be in balance and for your highest good. This will get easier with practice.