So I'm really just looking for some general life advice here about how to build positive habits.

Basically, I feel a strong desire to eliminate the negative habits I have in my life (watching TV, eating junk food, etc.) but I wonder if extreme removal of wasteful pleasures will ultimately lead to burning out and regressing, or if eventually you get over the hump you acclimate to a different lifestyle.

In people's experience, is it better to attempt to craft an excellent lifestyle, or a decent/good one that is easier to maintain? Thanks for any input.