Tullygrainey is correct, you cannot give up, persevering is the only way..........
A tip for brass kits that went a bit wonky;-
Take a blowtorch to the model, heat the whole thing up to melt the solder, hold the melt (don't overdo the heat, just enough to keep the solder liquid) and then pick out the parts with a tweezers, clean up the parts with the torch brushing the solder off with a fiber brush and your ready to go again!
White metal parts, if any, need to be removed first with a soldering iron.
Eoin