Start with the exact inputs. The 7th-house cusp, its ruler's house, and Mercury's house all require birth date, birth time and birth location. With a date alone, read Mercury's sign and its aspects and leave houses out of the reading.
Work in this order and the picture assembles itself. Find the 7th-house cusp sign — that is the version of partnership you protect. Find the ruler of that sign, note its house and aspects, and ask what it believes a disagreement costs. Then read Mercury's sign, house and hard contacts to Saturn, Mars or Neptune. Finally check Venus. If the 7th-house ruler carries hard Saturn or Pluto contact, the stakes are high. If Mercury is cornered, the sentence tangles.
Now name the pattern out loud in one sentence, using your own details: "I wait for a version of the truth nobody can object to, because a rupture here would cost me standing." Specific beats flattering. "I'm a people-pleaser" explains nothing and predicts nothing. If you want the longer version of that line between real diplomacy and self-erasure, the guide to where you smooth things over until it starts costing you is the honest next read.
Then take it to the transit chart. Enter your birth details plus the date and location of the conversation you are avoiding, and see which transiting planets touch your Mercury, your Venus or the 7th-house ruler. Transits do not decide what you say. They show you when the pressure on the same old reflex runs high, which is useful information for choosing your moment instead of letting the moment choose you.
That is the whole next step: one chart, one date, one sentence named out loud before you open your mouth. The reading located the reflex, priced the stakes, and flagged which excuse tends to arrive first. Sending the message is a decision, and nothing in the chart makes it for you.