if you wanted to play x songs.. no need to learn also can.
im a bassist also, and i am that lola lah..
i got took lesson also but a few months, coz i think its a waste. teach slow bla bla..
what you do is, practice at least 1 hour everyday...
i play 8 months only i perform silent jealousy, rose of pain, weekend, sadistic desire (yeah including the slapping part) on stage liao.. at youthpark.
i also can play dahlia, x, scars, rusty nail (this shd be ur first song), endless rain liao...
but i go through the hardway, i practice everyday.. guitarpro will be a good start...
but if you wanna be versatile, go take up lessons
just my 0.00000002cents tips ah... i also sucks at bass. not that good...
p/s:anyway hardest x basslines is ORGASM.. till now i cannot play perfect. damn damn hard. kurenai easier.