Call me sceptical, but my impression of solicitors is that they avoid simple solutions and like to overcomplicate things and drag things out to inflate their fee. I find it disgusting that this industry chagres such extortionate fees, preying on people when they are at their most vulnerable.
Bear in mind that the candle is burning at both ends - you have one pot of money but both parties are spending £100+ per hour at different solicitors. Like the previous poster said, the more a couple argue over who gets what through the solicitors, the less they will both get and the more the solicitors will get, so don't get sucked into all of that, it's a mug's game.
If you both can agree in principle on how to split your assets and you are both happy with that, then you could come up with a document outlining who gets what. Some people split amicably and don't involve solicitors at all, saving a fortune in costs.
But if you think it likely one of you will change your mind in the future and you want it to be legally binding then it would be advisable to get some legal assistance but be very well prepared before you go and see them. Have all your questions written down and ready, and a well defined course of action to minimise the risk of them going off on tangents or dragging things out and wasting time. Also be sure to only arrange extra meetings with them if there is a specific purpose to the meeting and if it will move things ahead quantitatively.