And if pressure canning makes you nervous, stick to just water bath canning.
I can't pressure can because I have a glass top stove (and I rent...my landlord would have kittens if I broke the stove) so I use a waterbath canner...you can still can quite a few things (including many tomato recipes) with just a waterbath canner! Bonus: they cost about $25 vs $80-150 for a pressure canner.