I don't mind the 505 and use it in the house. I do open a window (or door) for ventilation. I actually put an old sheet over the bed and do my basting there. First I layer backing fabric and batting so they are nice and smooth. Then I peel back the batting half way and spray the backing fabric. I smooth the batting down and then turn the piece over to do the same to the other side. Then I lay the top down and pull it back half way. This is when I spray the batting and smooth the top over it. When all is done, I press from both sides.
The most I have been able to make adjustments without respraying was twice. Generally my method works for me the first time as I go slow.