The only change I would make to what @valcrow has suggested is the move the print head to a corner.
By doing it as he describes, you are also doing an 'Atomic Pull' so that you are removing the old filament and cleaning the nozzle. When you remove the filament, look at the end of it and it should be a mold of the inside of the nozzle. Nice and clean!
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valcrow 145
You just have to reverse the loading process.
Unlatch the tension thing, (the black thing that clips onto the knurled bolt).
-Heat the temperature to 100C (assuming PLA, hotter if you need to pull too hard)
-And then pull the filament from the back.
-And that's it!
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