I find the easiest way to do blocking is make a small set plan with key features, give each an abreviation (T1,T2 etc for tables, StL for stairs left, and StR for stairs right etc) and put this at the top of a piece of paper. Copy one for each page of script, and insert it on either the left or right side facing that page in your prompt copy. Next, give each major character their own abbreviation.
Then use some form of blocking notation - document it whilst you do it - and write steps. I would then correlate these steps with numbers sketched into my script.
Ie - in this snippet, Stacey enters a Temple, crosses to a table, kneels, saying a prayer, then exits through an upstairs door.
(1) S en -> DSL T1 (k)
(2) S (s) -> StR upArrowHere ex
S being my abbreviation for Stacey, Enters, then Crosses to the Down Stage Left corner of Table 1 and Kneels
Stacey Stands then Crosses to Stair case Right, goes Up stairs and Exits.
There would be a (1) above my script towards the start of that scene when Stacey enters the monastery, then her prayer would be after that, and at the conclusion of the prayer would be the number 2.