Don't use one of those "gun" type soldering irons. Buy a GOOD "pencil" type soldering iron. It should be 35 to 40 watts if not temperature controlled. With a temperature controlled iron about 50 or 60 watts would be nice. Bigger connections (terminals) need higher wattage due to heat absorption. Too much heat will cause the traces on a circuit board to come unglued and lift off the board, then you need to repair the circuit board. Cheap tools do a lousy job and are frustrating . Good tools pay for themselves over time in the money you save repairing and making things. Junky tools make everything harder, are a waste of money, will discourage him and he'll likely get frustrated and quit. Use only ROSIN core solder made for electronics NOT ACID core or solid solder. Acid core solder is for plumbing, the acid can eat away connections . Tips need to be kept clean. Soldering is really fussy about things being clean. Buy a soldering iron with iron clad tips. Iron clad tips do not corrode like cheap tips. Corrosion makes the solder resist the surface and ball up . Also too little heat to the connection will cause solder to ball up. Heat the connection FIRST then apply the solder. A little solder on the tip while heating helps transfer the heat to the connection then apply enough solder to complete the job. If it balls up the connection is not hot enough. Keep tips clean by heating up the tip and wiping on a damp sponge then do the soldering . When done apply solder to the tip and let cool and solidify on the tip to help protect the tip from corrosion while in storage. Buy some de-soldering braid to undo or clean up connections . Just apply the de-soldering braid to the connection, place the soldering tip on top of the braid and heat it up . Try to make lots of contact with the braid and soldering iron tip. When it gets hot enough it will soak up the solder like a sponge . Copper based de-soldering braid has worked best for me . There are other de-soldering braids that are silver coloured rather than copper coloured that did not work well for me. If the braid is not soaking up the solder then you are not getting it hot enough. If the soldering iron is too low in wattage it may not be able to heat the braid enough. If the store is selling really old de-soldering braid it may not work properly. When you are done soaking up the solder from the connection the solder will be hardened in the copper braid . Just cut off the solder soaked copper braid with wire cutters or scissors to use the remaining clean braid for the next job.