In Bulgaria before 1989 studying Russian was compulsory, so we had a lot of Russian teachers (like from Russia). After the political changes those Russian teachers pre-qualified and started teaching English. Now, you can imagine their horrible pronunciation and stuff (sorry Russian people, I love you and everything, but most of you suck at English pronunciation). And yeah, my english pronunciation kinda sucks, but at least I t.r.y.
I think I have to live at least 3 or 4 months in the UK to get the real British accent. The good thing is that we have some British migrants in Bulgaria and I can practice with them.
PS:
And I don't think I should learn to pronunce only the words correctly, but whole phrases because in English sentences words aren't alone, but have some connections between them (like the "linking R" for example).