regarding whether markers are sufficient to make the kit look
real, i can't give u an answer. it depends on the techniques on
controling the panels, marker painted parts, etc. u can see some
hobby mags doing wonders with markers. but generally, plamodellers
will prefer airbrushing and enamel paneling when they have a budget
for airbrushing.
im jus a casual collector, and due to personal reasons, i can't
pick up airbrushing. it really depends on how u want ur kit to be.
dont really have to do "full set" to make the kit look really nice.
like me, i only sand away whole greasy surfaces of parts, clear
sprue gates, panel and decal them, and im happy with it.
ultimately, if u have the time and patience, be sure to try it.

edited:
@wcloudx: marker sets quite seldom seen in singapore. but hobby
point has them sometimes. at least $22 per set. and ultra fine
panel markers, can get at $3.90 la..