I found this video helpful. Others probably have no trouble setting a boundary and sticking to it, for me, growing up confused about my needs as well as what is and is not acceptable it has been hard for me firstly to set boundaries and then secondly to stick to them in firm, loving and less intense way. This video really helped me.
Emerging From The Dark Night 
Setting boundaries is so important. Even although it is hard at first, we soon get practised!!! and it makes all the difference …
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It makes us feel so much happier and clearer. Despite the emotional roller coaster to get there.
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