Do I really need an impact wrench?

[88gt150k]

ok ive gone through some hell gettin my crank bolt off and ive never had a impact break it loose. but im sure most will come free with a good impact set-up. but mine was just a pain.
heres how i broke mine free, block your wheels, put car in reverse, put a pair of channel locks on the harmonic balancer,
use your torque wrench(cheater bar) pull it
as far as it will go, hold it there repostion
the cheater bar for another turn. thus the forward motion of the car will help break it free. also if you have someone available
have them pressing the brakes.

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88gt gt40 irons mill/port, ported up/low efi,mac longs,1.6 rrs, crane fpr,fms a/c elim,dynomax s.t.,190lph,weld rims, bfg drs,3.73s, parts in limbo 24# inj and compcam .533 lift, 73 c&l mass
82gt 351w in limbo
89 4 cyl notch in limbo