See here for instructions to set up your CMSSW area.
See the DIL twiki for more information about how to use some of these scripts.
PyYaml is a pre-requisite. Install it locally after executing cmsenv:
cd /tmp
wget --no-check-certificate -O - http://pyyaml.org/download/pyyaml/PyYAML-3.10.tar.gz|tar xzf -
cd PyYAML-3.10/
python setup.py install --user
cd ..
rm -rf PyYAML-3.10/
Next, clone this repository into your CMSSW source area:
cd $CMSSW_BASE/src
git clone https://github.com/cms-ttH/ttHMultileptonAnalysis.git
cd ttHMultileptonAnalysis
scram b -j32