The major problem you will have is not knowing that the parts are 100% connected. It might look like it, but you have to be sure.
Pins on parts turn green when connected, and if you click on a pin all pins connected will turn yellow.
Always put a small wire between pins, don't just put them on top of each other.
If you want a junction right-click on the wire and create a bendpoint, the run the wire from the pin of the part to the created bendpoint. Grab the junction and move it and make sure all the wire move with it. This doesn't work properly with 4 wire junctions, because there is a bug, but you don't have any.
Be meticulous, and check and check again.