I agree with Jo. I really didn't like to press when I first started sewing. I thought it took up too much time, but after years of sewing, I found that pressing as you go keeps the material neater and you end up with a more professional look.
One of my bad habits was saying to myself just get it done. Now, when I get a seam that is not going as straight as I know it should be, I have to say to myself. STOP, go back and do it right. lol I say that a lot.
Syl