Waiting for spinal symptoms to appear (neck pain, headaches, sciatica…) before considering taking care of your spine and nervous system is kind of like waiting until you are morbidly obese before you decide it’s time to eat healthily and get some exercise.
Can you do it? Sure.
Is it good that you finally decided to make a change? Yes, of course! Good for you!
Can you make your way back to a state of better health? Absolutely, as long as you give yourself enough time and discipline and no permanent damage was done, you can make it back.
Will it ALWAYS be harder if you wait rather than take care of yourself along the way? YES. IT WILL ALWAYS BE HARDER. EVERY SINGLE TIME.