When I was an active JW in the field ministry, I was timid to the usual "no soliciting" sign and it was always an elder, or a po, or a c.o. who reminded me to not skip the house (which I did) with a "no soliciting" sign out front because the field ministry was not the same thing as soliciting (of course we're not soliciting members for our church, we're just warning you that if you don't become a member of our religion you're toast!) I was a rather timid witness, so didn't care if they joined the religion or not, but I never did liked the reasoning that was put into preaching to people who had conspicuously placed "no soliciting" signs (you know, maybe thay don't want anyone who they don't know knocking at their doors anyway).
BTW, whenever a house had a "no tresspassing" sign out in front it was said that it was okay to walk up to their door and preach to them as long as we stayed on the driveway (because the sidewalk usually led into someone's driveway, it was considered public property [8>]) Yeah, yeah...I know.
I think these are examples of a ministry that was conducted "by any means necessary". I often heard the illustration that if your neighbor was sleeping in a burning house, you would do anything in order to get their attention. But, of course, there was no danger. Hmmmmmmm.... too paranoid for me....