Go searching about the web for telescope making and you will find that a
large telescope will be a fairly long project but it will be quite rewarding
in the end. You may end up with various frustrations from not knowing how
to do something in particular but the web will show several techniques for
doing any particular part of the scope.
Aftger you have built the scope, you will really enjoy the scope afterwords.
I'd suggest that you go to some of the larger star parties that are
advertised nationally and you will find many scopes of all sizes that the
people have built themselves and you will come away with a lot of knowledge
and a firm belief that you can indeed do your own scope without serious
problems.

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Why isn't there an Ozone Hole at the NORTH Pole?