It is about as easy as falling off of a bar stool Well, that is if you put all the parts back the way they came off.
Start with the pump side. Remove the cover and note which order you removed the gasket and pump diaphragm. Do one side at a time and set everything in order of removal, it helps. Look at the screen under the pump, it can be cleaned, might have to be removed for cleaning. In actuality it isn't needed, but it keeps junk from going down stream any further.
This is probably all you have to do, but if you remove the other side to see if any junk is there, be sure to have the nipple on the diaphragm engaged in the fork of the needle arm when you replace it or your engine will run rich and probably leak fuel. Be careful not to bend the fork when removing the diaphragm. If you do need to take that side off go ahead and remove your L & H needle and blow some air thru them too.