I just pulled the motor on my '97 SSEi a couple of months ago and the way I got that bolt was by purchasing a cheap set ($12) of long 1/2" drive extensions at the local auto parts store. You need about 32" as I recall. The fewer joints, the better. I removed the passenger wheel and splash guard then set up a jackstand at the same height as the bolt at the outer end of the extension close to the handle. A breaker bar would be best, but I used a 15" flex handle (add a cheater pipe if necessary) and a 6-point socket on the other end that just fits the bolt. I can't recall the size (11/16" - 18mm? maybe) I n my case, the power steering bracket was off.
The 6-point socket and the jackstand setup will allow you to apply a great deal of torque without slipping. This is a bolt head you do not want to strip. Set up the handle at about a 10:00 o'clock position facing the bolt so the initial breaking force is downwards supported by the jackstand. Tap the whole deal in towards the bolt to remove any slack in the joints. Maintain a little inward pressure toward the bolt; and keep the extension perpendicular to the bolt with the help of the jackstand.