When you are done there should be no sign of gold colour on the bridges, and hopefully enough graphite will have fallen into the gap to fill it - which is what you are trying to do. I really do suggest a 2B pencil, as any harder and the graphite content is too low, and softer means that the graphite will just blow away. Then you can either try again, or just forget the whole idea. The harder technique is to use a permanent connection, usually with some form of conductive paint. With the conductive paint the idea is still the same, but the complication is that it is difficult to get the narrow strip of paint you need.
Isopropyl alcohol can remove the stuff with some difficulty, but at least it's harmless to plastic.
Ditto, if you miss one you might find it behaves in a rather odd fashion. The most common symptom is that you find that you can't select certain multipliers, usually the x.5 ones. Anyway, if you have managed this correctly, you can now set you multiplier of choice in either BIOS on via board DIP switches. So let's move on.