Solo levelling is easy, so don't be put off by it:

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PK lots in the 25 - 40 range. It's when you own everyone. Learn to PK without zombies. Treat yourself to a nice army once in a while when the PK range is nasty or there is a tough group of three you want to interrupt levelling.

When you distend into hero range; race to 47, take the mummy quest and become a hermit until you have your items and pass the RNG.

Avoid cabal politics until you mummy. Don't trust anyone; they won't trust you.

When bored, go find some humourous and unique corpses to raise.. like this Tribunal necro:
(Thu Mar 8 06:38:37 2007 by 'Rayihn' at level 33 (143 hrs):
Trucking around with a zombie of a traitorous city guard - that's stylish)

There is nothing scarier to me than a necro in the hands of someone competent.