I was 23yo when I was first cuckolded (constantly behind my back) and I'd say it took me 2 years to get over the hurt/ humiliation/ trust issues/ jealousy etc. Another 2 years of either accepting it, turning a blind eye to it and also painfully having to reconcile with myself that my penis size played a big part in why she wanted other men instead of myself and the rejection of it all.
It was not until my early 30's that I truly began to enjoy it, seek it out, find as many men as I could to fuck her and relished in SPH. By mid 30's I was a 'full blown' cuckold, very submissive, very bi and chased cock as much as she did. I've been like that for the last 20 years and love the lifestyle, could n't be anyone else but a cuck, its who I truly am. (very liberating)
I'm not to sure you can 'convince' a husband to become a cuckold, most men would ******* at the thought of their wife with another man, some would even blow his brains out if the could. Not too sure you can 'convince' a wife to become a hotwife, and to want to fuck other men she either has a slutty desire or not I believe.
Think its a slow burn entering this lifestyle and keeping your marriage intact as well. Perhaps start with vanilla swinging, and having him watch her with other men, whether that be black, white big cock or small. Its a lot to take in the first time watching another males ass clenched, balls raise while he unloads into your wife and he's just using her pussy for his own primal desires and that alone.