Coming out - good plan?

[clr9823]

I want to come out to my mum. I'm tired of getting defensive when she asks if there's any girls in my life, and tbh want to actually be open with her (may improve our sometimes fragile relationship) - I'm bi, but had this crush on a guy for like 2+ years now.
On Sunday (so in 1 day from this post) we're going through to see my Grandmother in another town. I'm planning to ask her to pull over then tell her - or tell her while driving. We're kinda private (we don't live together so hard to get time alone). I think I'm just going to go "Got something to tell you; I'm bi". I'm really shy and insular when it comes to anything personal regarding relationships, so I don't think I'll be able to say it in a much better way. Just wanting to ask all of your opinions - am I missing anything major in my plans which means I shouldn't tell her?
Oh btw, I think she's pretty liberal and cool with gayness - plus if I've got that wrong I rely on her for zilch so if things go pearshaped then I won't lose that much. I mean I'd be distraught if my mum was pissed because I was gay/bi (not entirely sure yet, think I'm bi but may be plain gay) but if she's willing to disown be over it then I'm willing to disown her over it. So yeah, big step in my life - am I missing anything that means I should put it off?

[Misfit]

Firstly do not tell her whilst she is driving! moving vehicle and High emotions are a really bad combination. Asking her pull over and telling her is also not a very good idea, just incase things do go south we don't want you being left on some road in the middle of nowhere. If I were you I would just steer clear of the whole telling her whilst driving/about to drive situation and perhaps just wait for another opportunity?

[CrossingtheCourtyard]

Moving vehicles are actually on the "No-No" list of coming out, as I am told. Things have the potential to get very bad very fast. It really all depends on your relationship with your mother.

It might be best to sit down and talk with her instead.

Admittedly I came out to someone while they were driving (It went like this: "Hey Dad, I'm bisexual.") and hell didn't break loose, so your results may vary.

[Dimitri]

I actually did it in a doughnut shop, I wanted a public place because I know my mother wouldn't go endothermic in public so I chose it there.

But yes, pending how your mother normally acts I wouldn't use a car, too potentially dangerous.

[swimmerboy95]

Firstly do not tell her whilst she is driving! moving vehicle and High emotions are a really bad combination. Asking her pull over and telling her is also not a very good idea, just incase things do go south we don't want you being left on some road in the middle of nowhere. If I were you I would just steer clear of the whole telling her whilst driving/about to drive situation and perhaps just wait for another opportunity?

Definitely agree. If you really want to tell her you should, but not in a moving vehicle where some really bad things could happen. Good luck with whatever you decide to do!
--Alex