First advice, you need a good fitting screwdriver for the power jet cover screw. If its not, you risk damaging the screw head. The cover screw could be in there really tight, give the screwdriver a tap to relieve some of the tension in the thread. I found a second pair of hands useful at this stage to hold the carbs so I could apply sufficient pressure to the screwdriver myself.

With this removed you need another good fitting screwdriver for the power jet itself, which could also be in there tightly. If your in any doubt, stop, and source the right tools. Other than that, its not at all complicated.
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Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30