First of all,
do not say there is
no instruction manual.
There is no single,
definitive one;
but there are
a myriad of choices.
It may take years
to find the one that
makes any sense at all.
Next, understand
that the parts you begin with
will not resemble
the finished product in the least.
As you proceed,
tab A will rarely
if ever
fit neatly into slot B.
Adjustments and approximations
are your best friends.
Remember that there are
always resources available;
friends will be willing
to lend a hand,
and customer service lines
for expanded knowledge
depend upon the manual chosen.
Finally...
work with the full knowledge
beforehand that
you will be the last to know
when you are done.