hey. You should expect to need a variety of specific tools, such as reamers, taps, drill bits, and specific diameter end mills. If you can provide the required tooling, you should not have problem machining a lower receiver so long as you follow required instruction regarding the machining process. Beware that you will be spending money on taps and mill components.......With the exception that the buffer end cannot be thread milled and you do not have access to any cnc equipment etc. Certainly do-able by any means, so dont be discouraged. Many have finished lowers via casting so give it a try. Castings are cheap! At least the ones I bought were.