There are so many ways to push past writers block.
Ones I use and work.
Switching mediums. Sometimes it's daunting to stare at the computer screen when you are not sure exactly where you want to take them or you know where just not how. I grab my notebook and pen and change locations. This helps clear my mind.
Outlining. This is an easy way to plan through a part that's causing me trouble. Outlines are easy to alter and can give a good picture. It doesn't matter if you end up sticking to them or not, sometimes just having lines to fill in the blanks helps to get those grey cells working again.
Sounding Board. Mine is my sister. Someone you can bounce your ideas off of in a creative manner and one who isn't afraid to say that idea is crap, you can do better than that. Sounding boards are worth their weight in gold, even if you are the one doing all the talking.
Clearing your head. Walking, taking a break, stopping for lunch, going out of the house for a while, listening to a cd. Music is extremely helpful, especially instrumental because it allows my brain to empty and refocus without outside interference.
Identify the problem. If you can find what is causing the block, it reduces the problem to what it is and allows you to think through it.
Skipping ahead. Sometimes when I am stuck on a problem, I will bookmark the spot and skip ahead to a part I already know how it goes. This gives me extra time to puzzle through it without holding my progress back.
Intruding Ideas. Sometimes my writers block comes from outside ideas bombarding me on future writing projects. I don't ignore them (they drive me crazy if I do) I write everything I can think about them down, then put them away and carry on with my current WIP.
These have worked for me for over 5 years now and having three children in the home I've had to become rather creative when it comes to not only finding the time to write but the clarity of mind when I do so.
I hope these help. Again these are my personal ones, they won't work for anyone, but you can take others and frankenstein them and taylor fit them to your needs.