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1. First install Mercurial (different on different platforms)
2. Next ensure that you have an OpenJDK user (http://openjdk.java.net/census)
   If you need an OpenJDK user name and/or generate a key, follow instructions here: http://openjdk.java.net/guide/producingChangeset.html#jdkUserName 
3. Next install the defpath plug-in (http://openjdk.java.net/projects/code-tools/defpath/)
4. Next create a ~/.hgrc file and fill it out according to the example below.

5. Next clone the JMC source: 

   hg clone http://hg.openjdk.java.net/jmc/jmc

Example minimal .hgrc file:

[ui]
username = youropenjdkname <your.mailaddress@example.com>
 
[extensions]
defpath = /usr/local/bin/hgext/defpath.py
 
[defpath]
username = youropenjdkname

Example, more comprehensive, .hgrc file:

[ui]
username = youropenjdkname <your.mailaddress@example>
merge = p4merge
editor = nano
 
[extensions]
defpath = /usr/local/bin/hgext/defpath.py
hgext.extdiff =
 
[extdiff]
cmd.p4diff = /Applications/p4merge.app/Contents/MacOS/p4merge
 
[tortoisehg]
vdiff = p4diff
 
[merge-tools]
p4merge.priority = 100
p4merge.premerge = True
p4merge.gui = True
p4merge.args = $base $local $other $output
p4merge.diffargs = $parent $child
p4merge.diff3args = $child $parent1 $parent2
p4merge.dirdiff = False
p4merge.checkchanged = True
 
[defpath]
username = youropenjdkname
 
[committemplate]
changeset = JMC-: <synopsis-of-symptom>\nSummary: <summary-of-codechange>\nReviewed-by: <reviewer>\n{desc}\n\n
    HG: Enter commit message.  Lines beginning with 'HG:' are removed.
    HG: {extramsg}
    HG: --
    HG: user: {author}\n{ifeq(p2rev, "-1", "",
   "HG: branch merge\n")
   }HG: branch '{branch}'\n{if(activebookmark,
   "HG: bookmark '{activebookmark}'\n")   }{subrepos %
   "HG: subrepo {subrepo}\n"              }{file_adds %
   "HG: added {file}\n"                   }{file_mods %
   "HG: changed {file}\n"                 }{file_dels %
   "HG: removed {file}\n"                 }{if(files, "",
   "HG: no files changed\n")}

You may also want to set up so that you can use p4merge for merging and diffing, and also use a template for commits. 

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