I am choosing to love myself completely.

Choosing is the interesting half, because feeling doesn't take instructions. Warmth toward a person can't be ordered up on a schedule, and that includes warmth toward yourself.

What can be done is the behaviour. Cancelling something because you are exhausted, rather than pushing through and being useless to everyone the next day. Eating properly on a Tuesday when nobody is watching. Not letting somebody talk to you in a manner you would never tolerate if they used it on your sister. Keep that up and the feeling tends to arrive later, persuaded by evidence rather than by argument.