Solicitors can charge from £200 per hour, cost can escalate quickly if you have one represent you. I read a wiki here went through court and between her and her ex they spent £50k!!!
You can negotiate/discuss things between you, go to mediation, use this site and the fantastic resources and experienced wikis - we have legals here too - giving free advice! you can do some paperwork/admin yourself and just use a solicitor ad hoc if you want - anything to keep the costs down.
There''s little point moving out if you have no-where to go, although it can be difficult living with the person you are divorcing
No, if you are joint owners (both on title deeds) then neither can legally get the other to move out.
The usual advice is to stay put until financial matters are resolved.
You may both need to grit your teeth and bear it for a few months more. I found some agreed ''Ground Rules'' worked when I was in the same position with my ex. We managed to work it so that I went out to visit friends when he was in and I stayed home when he was out, so we were rarely in the house at the same time. When we were, we kept out of each others way - I moved into the spare room which was smaller and had no TV, so I used that and the lounge and he had the bigger main bedroom which had a TV, so he stayed there. We staggered using the kitchen and bathroom and it wasn''t great, but we made it work until we got things sorted.