Thanks to the various blogs on the Renunciation of Malaysian Citizenship in Singapore, my progress so far has been rather smooth.  As I spent the requisite time at the Malaysian High Comm, I noticed that a lot of time can be saved if only the steps are clear.

Here, I return the favour that I have gotten by detailing my journey.

It started last year, when I decided that I have lived long enough in Singapore to apply for citizenship.  This was a rather straightforward process.

1. Check your eligibility and download a set of the application documents from the ICA Citizenship website.
2. Submit your documents to ICA.
3. Turn up at an interview where your documents are verified.
4. Wait for the approval, which will come in the form of a letter.  This will take between 3 to 6 months.

So much for the Singapore side.  By this stage, the application for citizenship is approved and all that needs to be done is to renounce your current citizenship.  The 'all that needs to be done' turns out to be multiple trips to the High Comm.  This is where it gets a bit unclear.  Having scoured the net for information, I followed their experiences to the T.

1. Bring along the approval letter, your Malaysian and Singapore ICs, turn up at the Malaysian High Comm.  It is advisable to turn up before the offices open at 8am, if you do not want to wait for long.  Go to the main entrance and exchange for an entry pass.  The entrance is along Cable Road.  With the pass, now you can enter the High Commission through the side entrance at Jervois Road.
2. Go to the Consular section, where you will receive a stack of documents to fill.  That's all you do on this day.

After all that, you get some papers to fill and a date to submit.  For me, it was 5 months out.
Ah, you will require some passport photographs when you come back to submit your documents.  So, while you have already spent a morning just to obtain the forms, you might just as well have your photographs taken.  There is a camera booth in the passport section.

So, when the auspicious day came, again I turned up at the High Comm.

1. Turn up early, exchange your pass, and go straight to the Consular section again, this time with all your filled up forms, supporting documents and photocopies, and your photographs.  Make sure you have everything they want.  It will be very sad to forget something, only to have to come another day.  Of special note are the following : Birth Certificate to be laminated; current and all previous Passports (if any are missing, you need to produce a Police Report).
2. Your forms will be checked and thumbprints taken.
3. This time, they will retain all your Malaysian identification documents and in return, you get a slip for you to turn up a few days later to collect a proof of submission.

Wait a few days.  In the mean time, make a booking with ICA to register yourself as a Singapore citizen.
1. Go back to the High Comm to collect a letter addressed to ICA that acknowledges their receipt of your documents.

With this letter, go to ICA to get your citizenship registration done.  You can also apply for your passport on this day.  You will then take an oath of allegiance to your new country.  Welcome to Singapore.

On registration day, you will be issued with a temporary NRIC card, while you have to wait for a ceremony to be held in your constituency where your newly mint pink IC will be presented to you.

That's not the end of it, though.  The renunciation process is not complete until you receive Certificate of Renunciation from Malaysia, a process which will take 2 to 3 years.  That's the Borang K that is mentioned in a number of websites.  That Certificate needs to be presented to ICA when the time comes.

Updates
1 April 2011 : Just got a letter from Malaysian High Comm telling me to go collect my Borang K.  Wow, this certainly more than met my expectations.  It has only been 9 months.  Next step is to go collect it and submit to ICA.  Then I'm done.