Creeper,
The Eichmann banana's that I bought were fool proof for a DIY beginner. I'm pretty sure the other styles are too. I hope I'm not misleading you on this but if they are like the banana's they come completely apart. The large back collar slips on the cable. The copper, or silver contact is removed from the outer plasic piece. Once the copper or silver is soldered into place and cooled you slip the back collar up the the soldered portion and insert/twist the outer plasic. You're done. You cannot melt any of the plastic.
The Eichmann banana's that I bought were fool proof for a DIY beginner. I'm pretty sure the other styles are too. I hope I'm not misleading you on this but if they are like the banana's they come completely apart. The large back collar slips on the cable. The copper, or silver contact is removed from the outer plasic piece. Once the copper or silver is soldered into place and cooled you slip the back collar up the the soldered portion and insert/twist the outer plasic. You're done. You cannot melt any of the plastic.