If you don't want to feel exhausted, just when you should be happier than ever, it would be better to sign a contract with a wedding planning agency. They are specialized in organizing events of this kind and have everything you could dream of for your wedding.
If you choose to organize your wedding yourself, you will need to start early to be able to organize everything until the wedding day. You need to take into account many elements such as the decor, wedding invitations, flowers, restaurant.
If you can manage to hire an event planning agency, you can save a lot of money and time. Before trying to solve everything yourself, turn to specialists. It doesn't cost you anything to try and they can give you useful suggestions and advice.

9-24 months before the big event

• engagement ceremony
• communicating the engagement to relatives and friends
• setting the official wedding date, taking into account the religious calendar
• establishing the budget and how to distribute it, as well as the size of the wedding (small wedding 40-80 people, medium wedding 80-200 people, large wedding over 200 guests)
• establishing the guest list
• contacting a specialized agency (from this moment your wedding plan can be made together with the agency's specialists)
• getting acquainted with events, exhibitions and accumulating as much information as possible about the wedding
• making a list of preferred locations for the wedding
• contacting a priest-officiant and establishing a ceremonial speech with him/her
• searching for accessories and formal attire for the bride and groom
• choosing a photographer – after consulting a presentation catalog
• choosing a cameraman – after watching some tapes
• choosing a DJ or a band
• choosing an interpreter

6-9 months before the event

• finalizing the details related to the hall, route, and the actual party (a real rehearsal of the entire event is recommended)
• planning associated events (Bachelor Party, Bachelorette Party – in Pajamas)
• booking essential items for the wedding night party (tables, chairs, dishes, decorative elements, tent, awning)
• contacting a florist
• establishing safe dates off from work (leave)
• booking the bridal suite
• planning the honeymoon and booking places (possibly obtaining the necessary passport and visas)

3-6 months before the event you need to take care of…

• purchasing the items needed for the ceremony
• buying wedding rings
• finalizing the guest list
• ordering invitations and confirmation cards
• addressing and sending invitations
• renting a limousine or other festive means of transportation (BM offers…)
• knowing a makeup and hair stylist
• purchasing other accessories for the gala outfit
• choosing the gift that will be offered by the groom to the bride and by the bride to the groom
• making a list of favorite songs
• choosing the song for the first dance or cake cutting

you will need to take care 1-3 months before the event...

• ordering the cake model
• getting appointments at beauty salons
• obtaining confirmations (related to honeymoon, gala attire, etc.)
• announcing the event in the press or through any other means of communication
• the last details – the most important ones 3-4 weeks before the ceremony
• consulting the specialized agency to obtain the latest confirmations
• contacting guests who did not announce their participation
• writing meal cards
• menu completion
• guest accommodation
• completion of official documentation (blood tests, medical examination, change/modification of identity documents)
• scheduling at a Church and a Civil Registry Office

the last week must provide the certainty of total success

• discussing last-minute details with the full-service agency
• drafting the final guest list
• last rehearsal
• packing for the honeymoon and making confirmations for the honeymoon

Either way, if you pay attention and patience to organizing your wedding, you will have a wonderful event that you will never forget.