1. The HKParts TRS Pliers is a *must* if you plan to swap TRS. Some could get buy with just a pair of thin, long-needle pliers (I did before HKParts released that tool)
2. The RennSteig punch set or a Grace USA punch set would do
3. A dental pick (for LEM conversion)
4. A good rubber mallet
What did you mean by "Another question is what one would be easier to start with?"