I made a similar n00b mistake myself with my one project - I paid attention to the coil voltage and current, and the contact ratings on the data sheet for the relays I needed, and totally ignored the physical dimensions. So now I have 10 pcs of a tiny relay similar to that one. Sure, the coil won't overload my micro, and the contacts can switch way over the expected current, but the things are so itty bitty it's hard to work with them. For breadboarding my project I just used male to female DuPont leads to connect the relays to the rest of the circuit on the board. Pretty sure I will go searching for physically larger relays to build up the final circuit, just to make it easier to attach wires going to the external screw terminals.