Toys like the TS100 are not what people think they are, and tend to cause more harm than good.

Thermal mass is important, please have a look at my other post for a recommended tutorial set. Silver based solders like SAC305 will also stick to most plated pin types.

Sometimes people are given a BS fools errand, and convince themselves there is some hidden secret to workmanship. You would have been better off with a $25 30W Weller iron and $7 flux+Wick kit off Amazon for through-hole style PCB kits. =3