No, it's not that difficult.  Remove the right kick panel
and you'll see the opriginal cable.  You get planty of access
through there.

. disaasemble the antena on fender, large nut above ball mount, remove .
remove passenger side kick panel, trace antenna lead to radio, remove from
radio tie a stout peice of string to the antenna lead, follow cable to cowl
side and gently push grommet through hole. feed antena lead through hole,
back outside now gentle lower antenna about 2 inches the grab arms should
pivot if not move them with your fingers, pull the antenna straigh up till
the cable is above the fender line. begin feeding antenna lead up through
fender until the string appears.
tape or otherwise secure the end of the string to the vehcile (so it doens't
fall back in) tie the string to the new antenna lead, feed the cable and
string back into the fender till the antenna is in the fender. back inside
use the string and pull the lead through the whole till the grommet is at
the panel ( a little wd 40 or grease helps here) using the antennad lead
gentely pull the grommet into place, route the remaing cable to the radio
and reinstall. backk outside. now but gasket over the antenna, then the
bezel or ball mount the finally the nut. pull the antenna up till the pivot
fingers are exposed push them down until they grab under the fender. pull
the antenna tight to the fender and thread the nut on the shaft locking the
bezel/ball mount into place.