It seems like cleaning house is the last stage.
Stage is a double meaning as in how it relates to multiple parts of a plan and as it relates to theater
Setting the stage therefore refers to completing the stages of the plan
The stage needs to be set before the HRC video can be released
So when the house is clean, the stage will be set for the vid drop.
The only questions remaining then are
what does cleaning house entail?
how will we know when it's done?
If it's referring to the midterms then that must mean Q team's intel suggests a sufficient number of Rs will win to take the house
We'll know when it's done when some major legislation is introduced to the house relevant to the plan.
This legislation would be the "lead-in" but the 11 house republicans calling on sessions to prosecute HRC, JC, LL, etc. may also be the "lead-in" and if so has the stage already been set and if so then we still need to know what cleaning house entails.
double meanings on "lead-in" could back that up as a lead-in outside the context of a play is generally 5 words or less and the mentioning of "lead-in" in Q post 158 was one day less than 5 months ago.