i agree with ceg ,yo uneed to have the right tools$$$$ and the experiance in porting dozens of cylinders before yo u know what bits to use and how to accurately use them to hit your durations sizes and shapes . youll need special stuff like a thin high speed rotary grinder,a right angle pencil grinder to get into your transfers and various sets of carbide ,aluminm oxide,sicion carbide,diamond ,flapwheels ,buff wheels ,and the list goes on,thsoe cd's are a waste IMO and you wont extract near the power that the jugs are capable of .there is no cd that wil l teach yo u off your pc what is needed .by all means practice ,gotta lear n and start somewhere ,just take your time and dont make it an expensive mistake ,its alot easier to take steel off than it is to put it back on and one quick accidental slip up can ruin a good portjob