As I mentioned earlier, in our case, my husband was not really the instigator. However, you are right that in most couples, it seems that the husband does introduce the idea to a reluctant wife.
You should do only what you both are comfortable with. If you are conflicted about an activity, you are probably not ready to try it. We did find, however, that taking baby steps outside our comfort zone allowed us to experience new adventures. If any activity turned out to be less than positive for either of us, we would not do it again or would figure out why we did not enjoy it.
The key to success is open communication between husband and wife, and understanding expectations and limits of each partner. We made some mistakes along the way, but in the end the lifestyle has worked out for us wonderfully. After years of near-monogamy, being with other partners exposed us to variety, but also taught us things that we could bring back to our own marriage. Paradoxically, we had more sex with each other after opening up our marriage. This is true for many other couples as well.
We have evolved into more of a cuckolding situation over the past couple of years. However, this is not because of any deficiency on the part of my husband. We are merely enjoying the kink of denial for now, but it does not have to be forever.