“Happy your way through problems” does not mean being a Pollyanna or ignoring reality, but it does mean that you do not have to put your head down and bull your way through everything. Sometimes a bit of fun and a head-high attitude can be more effective than a serious face.
Tackling problems with an attitude that this is going to be fun (vs. woe is me) can often unleash creativity and energy that can go a long way to unearthing solutions and building momentum. Yes, there will be valleys and setbacks, but there also will be mountain tops and days of sunshine. Sloughing your way through may work but “happying” your way through can work too, and is probably better for your health, internal and external.
“If you will call your troubles experiences, and remember that every experience develops some latent force within you, you will grow vigorous and happy, however adverse your circumstances may seem to be.” — John Heywood, English playwright and poet; 1497–1580