Organising the best stag do is hard but if you follow a few simple steps you can make your life easier.
9 months: Discuss ideas with stag and find out if there's anything he wants/doesn't want. Ask him for a list and contact details for everyone he wants to invite.
6 months: Firm up the date and let the lads on the guest list know. Suggest some firm ideas for the stag do (and costs) and sound out the guys for general happiness with the plan. Top-tip: when you're trying to agree a date, a really useful site is doodle.com
5 months: Book the stag and ask for deposit from everyone.
1 month: Get the final payment from everyone.
3 weeks: Ask for fancy dress ideas from the group.
1 week: send reminder of plan and any weather/last minute details. Make sure you include all contact details and confirm times etc. Start the banter and getting everyone excited about the stag party.