Got the Siebert eyepieces today and I wanted to try the streetlamp blocking idea so I went outside as soon as it was dark and it was a very clear night.  We placed the pole that we built against the streetlamp with the curtain we had cut and it blocked the light pretty decently.  Need to make some adjustments.  I just had enough time to try one of the eyepieces (the 15mm along with the 2x barlow) before some clouds did roll in.  Slewed to Saturn and the image looked pretty good but the seeing was bad so hard to really tell how good the eyepieces really are.  Just have to try again another night…