I find that unwrap is diffcult after apply modify of subsurface and solidy

.Because model has many many faces. And model is not a simple and thin

piece,coonnstruct of model has been changed. And I try to use "smart unwrap" ,which model has outer and inner part,which

is very complex. So I want to know: 1: To do uv unwrap before apply modify of subsurface and solidy or after

apply modify of subsurface and solidy ? 2: Any easy way that can make unwrap is easy after apply modify of subsurface

and solidy ? Thanks.