Definitely recommend giving it a go, to be honest as long as you're fairly handy you can pick up the knowledge required off the internet quite easily too. I found the best bet was to get a plane and get cracking, then deal with any problems as they come up - did my first bat with just one plane and it taught me plenty enough without getting too complicated in terms of tools. Any questions you come up with then the forum is always a good place to find answers.
Grade-wise, just buy low grades - the jump in price isn't worth it! Aldred does do part mades, I've had them from Hunts and H4L before with good results. Best to get in contact with whatever batmaker and chat it through with them as what different makers think of as a partmade can vary quite widely. Has anyone had a partmade off Jedi?