Diy Starter Or Solenoid Change-out

[BARNEYHYPHEN]

2000 LX470 76,000 MILES. WHEN I TURN THE KEY I GET ONE CLICK. ORIGINAL BATTERY BUT BATTERY TESTED YESTERDAY AT AUTOZONE AND CONFIRMED GOOD. SOUNDS LIKE A SOLENOID PROBLEM? PLAN ON CHANGING OUT ENTIRE STARTER ($200+) OR JUST THE SOLENOID ($90+). VERY MECHANICALLY CAPABLE BUT WOULD ASK SOME ADVICE. IS THE STARTER ACCESSABLE? HOW LONG IS THIS LIKELY TO TAKE ME. ANY AND ALL ADVICE MOST APPRECIATED. THANKS.

[itmdtr]

The starter is located underneath the intake plenum/manifold.