The stuff in the nozzle shouldn't be a huge problem, assuming it all goes back together nicedly. Then, once it's back together you can heat it all up and just extrude the vestiges of whatever was in the nozzle. What's likely causing the jamming is solidified filament in the heatbreak. This is harder to deal with. There's two approaches I'm familiar with, both challenging.

First, you can remove the extruder fan and let the heat from the heatblock creep up into the heatbreak until the jam becomes loose. The trick is to stop it then resolidifying before you can push it through. I'd use a wire rather than filament to poke it through.

Second approach is to heat up a wire rod and slide it down into the heatbreak. Twist it around so the stuck filament can adhere to it and then extract.

If you're lucky your printer may have come with something like this - https://www.3dprima.com/accessories/...inters/a-22070
Very useful tool.