HEPA filters will keep the smell contained to your grow room, as long as the door is closed when you open the tent. After you close the tent... within 20-30 mins all smell will be gone from the room. Without a room filter it could take several hours. It also removes mold/dust from the air, its a win/win.
Here's mine, placed between tent & my door.
View attachment 5214807
Next...
I suggest you put the tent in a bedroom, or any other room with a door & get a digital lock for that door. Always lock it before you leave home, incase any nosey landlord drops by.
Overall, relax man... it's not nearly as hard/bad as you think. I was on here 7 months ago asking the same questions. It's relatively simple (all of it). You're all good, get going & have fun!