Start by studying:

www.autozone.com 's free repair guide for the 90 Accord. On
the left, click on "Repair Info," then "Vehicle Repair
Guides." Click on car year, make, and model, etc. Go to
Suspension & Steering, Front Suspension, Upper Control Arm.

http://www.tegger.com/hondafaq/faq.html . Go to the
Driveline etc. section.

Keep checking back. Others are likely to post with specific
tips.

Out of curiosity, why are you replacing these?