To make a habit of practice, set a Rule. For example: 3 Short Forms, 10 minutes standing meditation, 20 minutes seated meditation daily. Keep the rule religiously. My own teacher said only consider breaking the rule if someone desperately needs your energy instead. Never let your own feelings get in the way. The whole idea of a rule is that it cuts through your superficial laziness to a heart of courage and destiny beneath. If you find yourself breaking the rule often then reduce its demand otherwise you'll weaken your resolve.