Don't worry about not having the perfect set-up for sewing -- it's actually better for your health if you get up from the machine, walk to the next room to press and maybe even to another room to cut and pin the next step-- too much time in the one position will ruin your back/neck/shoulders.
And another tip I read here that made me laugh out loud "SEW RIGHT SIDES TOGETHER" -- the very next day I sewed a block incorrectly!
You make more mistakes when sewing fabric you don't like,(even if it's cheap) and even if you finish it into a perfect piece of work, you started out with something you didn't like-- so why would you like the end product? Life is too short to put up with anything you don't like.
Finished is better than perfect (I have named a few of my quilts this!) -- I know others have said it here, but there will come a time (or many times) when you will mutter this to keep on going.