Welcome,

Listen to Robin and read through the posts. Rigidity will really help in accuracy as well. If you want to chat to someone who has climbed the first parts of the learning curve and willing to help drop me a message and will reply. I am up in Edinburgh from you (A bit farther North). Good luck and keep looking and reading. As pointed out above too much power is just as big a problem as to little power (heat is problem all around).

Again take care and good luck.

Michael